publicationDate stringlengths 10 10 | abstract stringlengths 0 37.3k | title stringlengths 1 5.74k | doi stringlengths 11 47 ⌀ |
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1997-01-01 | The study of electron atom collisions involving polarised partners have been of major interest in the past ten years. These experiments when analysed using the density matrix formalism reveal the most detailed information on the role of the spin interactions during the process (Bartschat, 89). This experimental techniq... | Spin Effects in the (e,2e) Cross Sections of Xenon | null |
1997-01-01 | Ultrathin bcc iron films grown epitaxially on W(110) have been investigated by means of angle and spin resolving photoelectron spectroscopy. The electron spin polarization, spin resolved intensities and corresponding band structure have been experimentally investigated in dependence of the film thickness, exciting phot... | Surface magnetism of iron on W(110) | null |
1996-12-01 | The cooperativity of the thermal spin transition in the Fe(II) spincrossover compound [Fe(ptz)_6](BF_4)_2 (ptz = 1-propyltetrazole) and in isomorphous mixed crystals with the isostructural zinc complex is investigated. From powder X-ray measurements the lattice deformation (tensor ε) accompanying the spin transition is... | The cooperative spin transition in [Fe_xZn_1 − x(ptz)_6](BF_4)_2: II. Structural properties and calculation of the elastic interaction | null |
1996-10-01 | Synthesis, spectroscopic and magnetic properties of iron(III) complexes with N,N′-ethylenebis (salicylaldimine) and β-diketones | null | |
1996-08-01 | Whether spin-independent Coulomb interaction in an electron system can be the origin of ferromagnetism has been an open problem for a long time. Recently, a “constructive” approach to this problem has been developed, and the existence of ferromagnetism in the ground states of certain Hubbard models was established rigo... | Stability of ferromagnetism in Hubbard models with nearly flat bands | null |
1996-04-01 | In two dimensions the three-band Hubbard model with additional lifting of the degeneracy of the two spin directions (e.g. due to spin-orbit coupling) is investigated. The calculations are performed using self-consistent field methods. At half filling, for the nearly antiferromagnetically ordered state, the Hamiltonian ... | The three-band Hubbard hamiltonian with spin-orbit coupling: Canting and localization | null |
1996-04-01 | Both static and dynamic Jahn-Teller (JT) effect was first observed in electron spin resonance (ESR) on rare carth (RE) ion (ESR of Sm^3+ ions in mixed-valence compound SmB_6). | Jahn-teller effect on Sm^3+ ions in mixed-valence compound SmB_6
| null |
1996-03-01 | A new combination of three-point bending stress and electron spin resonance (ESR) methods was developed and successfully tested in the field of glassy and ceramic materials. Summarizing the observed phenomena, one can establish the following advantages of such an experimental combination: (i) direct and continuous obse... | Electron spin resonance in situ observation of the bending stress process in corundum materials and glasses | null |
1996-02-01 | The^195Pt Knight shift of the high quality single crystal UPt_3 measured down to T =28 mK have revealed no change across T _ c regardless of the applied field directions and of the superconducting multiphases. An estimation of the spin part from the T linear specific heat has ensured no variation of the dominant spin p... |
^195Pt Knight shift study of single crystal UPt_3—evidence for odd-parity pairing— | null |
1996-01-01 | In recent years there has been an increasing study of compounds of the lanthanides and, to a lesser extent, of the actinides. These two groups of elements have varying numbers of electrons in their f orbitals (4f for the lanthanides and 5f for the actinides), thus inviting a comparison with the transition metal element... | f electron systems: the lanthanides and actinides | null |
1996-01-01 | This chapter will discuss the theory and applications of the photomagnetic and magnet-optic effects. These two phenomena are conceptually very similar but differ mainly from their point of reference. Photomagnetism may be described as the change in the magnetic response of a material that results from exposure of that ... | The Photomagnetic and Magneto-Optic Effects | null |
1996-01-01 | In Part I the physical mechanism of exchange interactions have been discussed. In this part we introduce the general concept of spin-hamiltonian. Isotropic exchange hamiltonian for many-electron polynuclear clusters (Heisenberg-Dirac-van Vleck-HDVV model [1-6]) will be derived. Spin-hamiltonian approach allows to separ... | Exchange Interactions II: Spin Hamiltonians | null |
1996-01-01 | The aim of our experiments with transversely polarized electron beams of 300 keV is to investigate the role of the spin-orbit interaction of the continuum electrons in the processes of electron-impact ionization and bremsstrahlung. | Spin Asymmetries in Relativistic (e,2e) Processes and Bremmstrahlung | null |
1996-01-01 | The hyperon-nucleon G -matrix interactions derived from the Nijmegen and Jülich potentials are shown to have remarkably different spin character which should be reflected in light hypernuclei. Various outputs of the calculations are demonstrated in connection with the recent ( π ^+, K ^+ ) data from KEK. A possibility ... | Hypernuclear Structure and Hyperon-Nucleon Interactions | null |
1996-01-01 | Although little use is made now of the theory presented in this chapter, it contains the basis of all of those that are used. It provides the foundation, particularly for the understanding of spectral and magnetic properties; all else is elaboration and refinement. A knowledge of simple crystal field theory is therefor... | Crystal field theory of transition metal complexes | null |
1996-01-01 | A characteristic feature of the chemistry of technetium in the +5–+7 oxidation states is the formation of a wide variety of highly stable complexes containing the terminal Tc≡N bond. The Tc≡N bond is short (1.585–1.65 Å) and formally triple with one σ component and two π components formed by overlap of px and py orbita... | The chemistry of technetium nitrido complexes | null |
1996-01-01 | Discussion of connections between different phenomena observed in seemingly different situations usually helps to better understanding of the physics of underlying processes. Some time ago Farago^1 discussed analogies and contrasts between light polarization and electron spin polarization. He showed that though in both... | Photoionization of Polarized Atoms Applications to Free Atoms and Ferromagnets | null |
1996-01-01 | The superconductivity discovered by Onnes in 1911 is a fascinating phenomenon appearing in metals. The observed diamagnetism and anomalous specific heat indicated that this behavior arises from the thermodynamic nature of the electron system. The list of known materials exhibiting superconductivity had expanded from el... | Routes to High T_c Molecular Superconductors | null |
1996-01-01 | I would like to present some new results regarding the origin of mass and distributions of electric and magnetic charges in an elementary particle. The discreteness of the electric charge distribution and its confinement results from the layered distribution, with alternating signs, of the magnetic charge. It is found ... | Innermost Structure of Matter | null |
1996-01-01 | Till only a few years ago, all known materials showing spontaneous magnetisation at finite temperature were continuous lattice compounds, that is, their crystal structures contained no identifiable molecular units of the kind that would survive dissolution in a solvent or evaporation into the gas phase. But are the bas... | What is Special about Molecular Magnets? | null |
1996-01-01 | One of the earliest applications of crystal field theory was its use to explain irregularities in thermodynamic and related properties of a series of transition metal complexes as the transition metal was varied. These applications are usually dealt with in one of the early chapters of a book such as this; their consid... | Thermodynamic and related aspects of ligand fields | null |
1995-07-01 | Spectroscopic properties and crystal-field analysis of Cr^3+ ions in kyanite Al_2SiO_5
| null | |
1995-07-01 | The role of lower symmetry component of the crystal field in causing a mixing of excited 3d^ x −1 4s with the ground 3d^ x configuration and leading to spin density at the nucleus for iron group ions was suggested by Griffith and Orgel. This mechanism has been examined in detail for the two low-symmetry copper complexe... | Effect of crystal field on the spin density at the copper nucleus in copper complexes | null |
1995-02-01 | The science objectives of the Toroidal Imaging Mass-Angle Spectrograph (TIMAS) are to investigate the transfer of solar wind energy and momentum to the magnetosphere, the interaction between the magnetosphere and the ionosphere, the transport processes that distribute plasma and energy throughout the magnetosphere, and... | The Toroidal Imaging Mass-Angle Spectrograph (TIMAS) for the polar mission | null |
1995-01-01 | We review the information that may be obtained from the analysis of the spin dependence of the scattering of electrons from the surface of magnetic materials. Two sources of spin dependencies are explored: those introduced by the spin orbit effect, and by the exchange coupling between the beam electron spin, and the un... | The Spin Dependence of Elastic and Inelastic Scattering of Low Energy Electrons from Magnetic Substrates | null |
1995-01-01 | The study of well ordered, chemically pure, crystalline solids in thermal equilibrium has occcupied a prominent position in traditional condensed matter physics. It is less well known that systematic studies of classes of poorly ordered, chemically impure, noncrystalline materials, often not in a state of thermal equil... | Disordered Electronic Materials and Spin Glasses | null |
1995-01-01 | Quantum-well states (QWS) are well known from semiconductor hetero structure s and have recently also been discovered in metallic overlayers on metal substrates^1. Such metallic overlayers with thicknesses up to 30 atomic layers (AL) form a quantum well for the electrons inside them. One barrier of the quantum well is ... | d-Like Quantum-Well States and Interface States of Paramagnetic Overlayers on Co(0001) | null |
1995-01-01 | Exchange of identical particles — here the exchange of the free electron with an atomic electron — is a quantum phenomenon. The spins play the role of markers: Elastic scattering “with exchange” can be distinguished from scattering “without exchange” if the two electrons have antiparallel spins. The spin dependence of ... | Measurement of Exchange and Spin-Orbit Interaction Effects in Elastic Electron-Cesium Scattering | null |
1995-01-01 | The quantum theory of measurement considers measurements as physical processes subject to the laws of quantum physics. The minimal interpretation of quantum mechanics dictates the basic requirement for a process to be a measurement: the probability reproducibility condition. The general measurement theory, as outlined ... | Measurements | null |
1995-01-01 | This section presents an approximate calculation of the energy levels for the helium atom as shown in [F171, problem 90]. We make use of a pure Coulomb Hamiltonian, i.e., no spin-dependent forces are included. The wavefunction separates into a spin part and a spatial part. We cannot ignore the spin part, however, as th... | Many-Particle Problems | null |
1995-01-01 | There are three types of superoxide dismutases (SOD), based on the metal involved in the catalysis {Cu(II), Fe(III) or Mn(III) in the native enzymes}. The most intensively studied protein is the copper-zinc superoxide dismutase (Cu-Zn)SOD and its metal substituted derivatives^1 : an imidazolate bridging the two metal i... | Magnetic and EPR Studies of Superoxide Dismutases (SOD): Electronic Structure of the Active Sites for the (Copper-Zinc)SOD, its Cobalt Substituted Derivative and the Iron(III)SOD from E. Coli
| null |
1995-01-01 | Some open problems in the fields of high-spin physics and exotic shapes are considered. We discuss pairing properties, octupole effects and the possibility for high-K isomers in superdeformed nuclei, as well as the posible existence of hyperdeformed nuclei. Clustering effects in very light nuclei leading to the formati... | High spins and exotic shapes | null |
1995-01-01 | The STM (Scanning Tunneling Microscope) is a new revolutionary technique which was invented approximately 15 years ago in IBM Zürich Laboratories by Binnig et al. (1982, 1983). Since this invention the STM has been found to be an extremely useful technique for many applications. The fundamental characteristic of quantu... | Scanning tunneling microscopy (STM) methods for detecting ESR of a single spin center | null |
1994-10-01 | The expansion of the { B _2} and { B _4} tensors of the spin Hamiltonian (SH) for Mn^2+ (^6S-state) is performed in terms of the irreducible tensor products { V _L _1 ⊗ V _L _2}_2 and { V _L _1 ⊗ V _L _2}_4 of the crystal field (CF) tensors { V _L _1} and { V _L _2}. The EPR spectra of Mn^2+ in the ZnSeO_4·6H_2O crysta... | Topology of spin Hamiltonian and crystal field tensors for Mn^2+ in ZnSeO_4·6H_2O crystal | null |
1994-08-01 | It is widely held that Bohr has shown that the spin of a free electron is not measurable. We point out that Bohr's argument has some important ifs and buts. A concrete configuration is calculated to produce a clear spin separation. This is then shown not to contradict Bohr's reasoning. | On the possibility of measuring the electron spin in an inhomogeneous magnetic field | null |
1994-03-01 | High spin states of the nucleus^144Nd have been studied using the techniques of gamma-ray spectroscopy and the^130Te(^18O,4n) reaction at 85 MeV. It is suggested that a sequence of states having J=17–24 arises from the coupling of the h _1 ^2/3 g _7 ^2−1 proton configuration to the f _7 ^2/2 and f_7/2h_9/2 neutron conf... | Possibleπ(h
_11
^2/3
g
_7
^2/−1
) states in^144Nd | null |
1994-03-01 | In a recent paper, Luck investigated the critical behavior of one-dimensional Ising quantum chains with coupling constants modulated according to general nonperiodic sequences. In this note, we take a closer look at the case where the sequences are obtained from (two-letter) substituion rules and at the consequences of... | Nonperiodic ising quantum chains and conformal invariance | null |
1994-02-01 | Various aspects of the problem of reliability of the standards for spin dosimetry in solid samples containing transition metal ions are discussed. A method of preparing standards for d^1 and d^9 ions, based on vanadyl- and copper sulfate, is described. Reference samples with various spin concentration were prepared by ... | Spin dosimetry in catalysis research | null |
1994-01-01 | We discuss the basic theory underlying the x-ray magnetic circular dichroism technique with emphasis on 3 d transition-metal atoms. The basic concepts are developed from an elementary level and illustrated by model calculations using an atomic picture and a simple Hamiltonian that accounts for two key interactions asso... | X-Ray Magnetic Circular Dichroism: Basic Concepts and Theory for 3D Transition Metal Atoms | null |
1994-01-01 | A simple non-empirical method is applied to calculate the splittings of the ground state triplet, caused by the spin-orbit coupling, in bis(aquo) bis(malonato) nickel(II), allowing for a certain geometry variation. The calculations yield splittings on the order of 10–20 cm^−1. The comparison of exact (within model) and... | Simple non-empirical calculations of the zero-field splitting in bis(aquo) bis(malonato) nickel(II) | null |
1994-01-01 | Thermodynamic Properties of Ultrathin Ferromagnetic Films | null | |
1994-01-01 | We present detailed formulas and a discussion which link the computational methods of the unitary group approach with radial and angular integration techniques used to determine the operators and wavefunctions of many-electron systems. The work is intended for researchers who should find it useful for purposes of pract... | The Unitary Group Approach in Context | null |
1994-01-01 | The properties of a metal atom are very different from those of a bulk metal. The question of how such properties evolve in going from one atom to an infinite lattice of atoms is a central theme in the research on metallic clusters. Apart from learning how the sometimes very disparate properties of the two limits conne... | Magnetic Properties of Metal Cluster Compounds | null |
1994-01-01 | For many purposes we can ignore the spin of electrons and holes in semiconductors. Thus an exciton in GaAs is often treated as a two level system although in reality the 1s orbital level of the electron and hole consists of several different states corresponding to different orientations of the spins of the particles. ... | Spin-Related Effects in III-V Semiconductors | null |
1994-01-01 | EPR spectroscopy has been used to study the addition of free radicals to C_60. The hyperfine interactions of protons and ^13C nuclei identify the species formed as mono-, tri- and penta-alkyl adducts. In mono-alkyl adducts (R-C_60) the unpaired spin is localized near the R-C bond, and they exist in thermal equilibrium ... | The Hyperfine Interactions of Free Radical Adducts of C_60
| null |
1994-01-01 | It is well known that some molecules exist in two distinct forms which are mirror images of each other. These so called ‘chiral’ or ‘handed’ molecules have been studied for very many years using polarised light. If we pass linearly polarised light through a system of chiral molecules the plane of polarisation is rotate... | The Scattering of Electrons by Chiral and Oriented Molecules | null |
1994-01-01 | In Chapter V we have seen how neutrons can determine magnetic structures, that is the arrangement of the moments of the different magnetic atoms in the crystal. On a smaller scale the neutrons are also a unique tool to reveal the details of the distribution of the magnetization density around the nuclei of the magnetic... | Magnetic form Factors and Magnetization Densities | null |
1994-01-01 | The 2-Magnon-Ramanscattering has been measured on single crystals of YBa_2Cu_3O_ x with different oxygen concentration. The decrease of scattering intensity upon doping can be interpreted as a reduction of antiferromagnetic ordered spin pairs and is in good agreement with recent neutron scattering results. On the other... | Two-Magnon Raman Scattering in Doped YBa_2Cu_3O_
x
with Respect to Confined Hole Clusters | null |
1994-01-01 | With the advancement of our ability to account for many-electron correlation effects in atomic and molecular electronic structure calculations, particularly when exploring systems undergoing chemical reactions or other dissociative or associative processes, more and more emphasis is being placed on a proper size-extens... | Algebraic Approach to Coupled Cluster Theory | null |
1994-01-01 | Many covalently bonded molecules have sufficient geometric stability so that they can exhibit stable chirality. When substances are not racemic mixtures, it has long been known that a consequence of chirality is their optical rotatory power and the associated phenomenon of circular dichroism . Some years ago Farago^1 a... | The Scattering of Longitudinally Polarized Electrons from Chiral Molecules and Optical Rotatory Power | null |
1994-01-01 | Construction of outer-electron energies in oxides is reviewed within the context of an ionic model. The 5 s and 6 s conduction bands of Group-B metals are distinguished from the s bands of other main-group oxides. Localized 4 f ^n configuration energies are located relative to the edges of the broad bands in rare-earth... | Electron Energies in Oxides | null |
1994-01-01 | Elementary excitations for impurity models are investigated with the use of the Bethe-Ansatz solution. We study three kinds of Hamiltonians concerning the Kondo problem: the ordinary Anderson model, the orbitally degenerate Anderson model and the multi-channel Kondo model. The calculations for the multi-channel Kondo m... | Elementary Excitations for Impurity Models | null |
1994-01-01 | These elements belong to the lanthanides or rare earths (REEs), a group of metallic elements with atomic numbers from 57 to 71 inclusive which all have similar properties resembling those of aluminium. Samarium has an atomic weight of 150·35 and an atomic number of 62 with a relative density of 7·536 and a melting poin... | Other Dating Methods | null |
1993-12-01 | A new method for block-diagonalizing large Hamiltonian matrices, in closed form, is described. The method is based on (i) a general unitary transformation due to Slichter, and (ii) Fano's unit spherical operators Û _Q ^K ( I _i, I _i). The method is illustrated with a simple three spin 1/2 dipolar coupled spin system, ... | Analytical block-diagonalization of matrices using unit spherical tensors | null |
1993-11-01 | Ab initio calculations of parameters which characterize the NMR spectrum are presented for the cyclopropene molecule. The London orbitals CHF (or GIAO-CHF, Gauge-Independent Atomic Orbital Coupled Hartree-Fock) results for the shielding constants are in good agreement with the experimental data, accurately determined, ... |
Ab initio study of the NMR shielding constants and spin-spin coupling constants in cyclopropene | null |
1993-09-01 | A self-consistent set of real spin-orbit coupling coefficients for the icosahedral double group is derived. Construction of the basis, resolution of multiplicities by spherical operator techniques, and typical applications to Zeeman and crystal-field problems for transition-metal atoms and lanthanides in icosahedral en... | Spin-orbit coupling coefficients for icosahedral molecules | null |
1993-07-01 | The structure of the algebra generated by one-electron charge and spin density operators with an appropriately defined convolution product is investigated in the context of the unitary group approach (UGA) to the many-electron correlation problem. The new idempotent density operators, defined via the unitary group U ( ... | Unitary group approach to reduced density matrices | null |
1993-03-01 | The strong influence of relativity on the hyperfine interaction is demonstrated by non-, scalar andfully relativistic calculations for solid transition metal systems. By calculations of hyperfine fields andof the nuclear spin lattice relaxation rate of Ag in Ag_ x Pt_1− x it is shown that scalar relativistic calculatio... | Consequences of relativity for the hyperfine interactions — with applications to transition metals | null |
1993-03-01 | From an electron spin resonance measurement on a single crystal sample of the S =1 linear chain Heisenberg antiferromagnet Ni(C_3H_10N_2)_2NO_2ClO_4 (NINO) containing a small amount of Cu impurity atoms, we have observed two sets of four hyperfine lines, one of which has almost three times larger field splitting than t... | Hyperfine interaction in a quantum spin chain | null |
1993-03-01 | The expeprimental (e, e′p) program at Mainz is presented. The reaction (e, e′p) without spin degrees of freedom is compared with the case when polarization observables are considered. It is demonstrated on some examples how the new information can be used to extend the knowledge of the reaction mechanism and nucleon/nu... | Towards spin degrees of freedom in (e, e′p) | null |
1993-01-01 | The discovery of exchange coupling between ferromagnetic films separated by a nonmagnetic spacer layer over distances of a few nanometers has provoked a renaissance in the research of magnetism. So far only metals have been studied and long as well as short period oscillations have been observed.^1The theoretical descr... | Exchange-Coupling Between Ferromagnets Across Non-Metallic Amorphous Spacer-Layers: Si and SiO | null |
1993-01-01 | I give a rigorous discussion of the group theory applicable to triplet superconductors and a list of possible symmetries and order parameters. It is “vanishingly improbable” to have curves of vanishing gap on the Fermi surface | Symmetry properties of triplet superconductors | null |
1993-01-01 | The read process in magneto-optical recording utilizes the polar Kerr effect and Faraday effect for metal and oxide media, respectively. These magneto-optical effects are discussed with respect to their spectral, compositional, and temperature dependencies primarily for amorphous rare-earth transition-metal alloys. In ... | Magneto-Optical Properties of Recording Materials | null |
1993-01-01 | The spin-statistics theorem is quite a remarkable one since it correlates two very distinct kinds of symmetries, namely spin symmetry, which is a property of single particles, and exchange symmetry, which is a property of sets of particles, and is trivial for single particles. The theorem is, of course, well-establishe... | Spin-Statistics and Topology | null |
1992-10-01 | The Steven’s method of molecular orbitals for octahedral complexes containing transition metal ions has been used for estimating the binding parameters and interpreting the g factors of VO _2 ^+ ion in single crystals. The expressions for g factors have been given in terms of K _‖ and K _⊥ taking into account the tetra... | Covalent binding parameters and the ground state wavefunctions of vanadyl ion complexes | null |
1992-07-01 | The Intermediate Nelgect of Differential Overlap model for spectroscopy has been extended to lanthanide complexes by including spin-orbit coupling. The method uses atomic spectroscopy and model Dirac-Fock calculations on the lanthanide atoms and ions to obtain ionization potentials, Slater-Condon factors and basis sets... | Intermediate neglect of differential overlap spectroscopic studies on lanthanide complexes | null |
1992-04-01 | Non empirical methods for obtaining information from EPR, ENDOR and optical data on the true impurity-ligand distance, R , as well as on the true variations, Δ R , induced by chemical and hydrostatic pressures, phase transitions in the host material and temperature changes are discussed through this work. Special atten... | Impurity-ligand distances derived from magnetic resonance and optical parameters | null |
1992-01-01 | ZnS | null | |
1992-01-01 | Recent advances in experimental high spin physics are discussed. The advent of arrays of high performances Compton-suppressed Germanium detectors has allowed weakly populated exotic structures in nuclei to be observed. The observation of discrete-line superdeformed bands at the highest known spins has posed many physic... | Recent Spectroscopy of Exotic Nuclear Shapes at High Spin | null |
1992-01-01 | Transition-metal compounds form a wide group of solids which exhibit various magnetic and electrical properties. Among them, magnetic insulating oxides are generally considered as typical examples of systems where magnetic properties are determined by strongly localized d states of transition-metal atoms. In the crysta... | Superexchange Interaction in Magnetic Insulators | null |
1992-01-01 | So far, the emphasis has been placed heavily on the computation of the wavefunctions and energies of molecular stationary states — with or without the inclusion of nuclear-motion effects. But what do we do with such information? Obviously we should ask how it may be used in the discussion of a very wide range of molecu... | Molecular Properties | null |
1992-01-01 | The basic concepts and requirements of condensed-matter studies employing positive and negative muons ( μ ^+, μ ^−) or positive pions (π^+) are briefly reviewed. As examples for the various experimental techniques and for their application to solid-state problems the paper discusses the determination of the sites of th... | Muons and Pions as Probes in Condensed Matter | null |
1992-01-01 | The natural sensitivity of the conductance of mesoscopic-sized samples to the specific scattering potential has been theoretically proposed as a method to explore the complex frozen magnetic order in systems such as spin-glasses. Recent magneto-transport measurements on 1000 ppm Cu Mn films and wires demonstrate phase ... | Probing Spin-Glass Configurations with Mesoscopic Conductance Fluctuations | null |
1992-01-01 | The electron is the lightest elementary particle, discounting neutrinos. All chemical properties of atoms and molecules are influenced and determined by the electric interaction of electrons with each other and atomic nuclei. | Properties of Elementary Particles, the Building Blocks of the Universe | null |
1992-01-01 | The mesoscopic physics of small metallic particles is briefly reviewed from a historic point of view. | Meso-scopic Physics of Small Metallic Particles | null |
1992-01-01 | Crystallographic sites of muons and pions are determined using channelling effects of the charged decay particles. By means of time differential techniques at pulsed beams the fate of the particles in the crystal is followed by measuring the channelling profile as a function of time between implantation and particle de... | Light Particles in Solids — μ
^- in Semiconductors | null |
1992-01-01 | There are three special, related techniques which have contributed incisively to studies of hydrogen in semiconductors: Electron-Paramagnetic Resonance (EPR), Perturbed Angular Correlation (PAC), and studies of muons in semiconductors. We anticipate that these techniques will contribute even more in the future, because... | Resonance Studies Pertinent to Hydrogen in Semiconductors | null |
1991-12-01 | Overview of application of pulsed EPR is given. | Some applications of pulse techniques in EPR | null |
1991-12-01 | The effect of the chlorofluorocarbon halotane on DPPC unilamellar vesicles was investigated by Electron Spin Resonance (ESR) spectroscopy. The X -band ESR spectra showed prominent thermotropic behaviour of the interfacial region of vesicles at different halotane concentrations. A model of molecular interaction between ... | Chlorofluorocarbon interaction with DPPC vesicles: An ESR investigation | null |
1991-11-01 | A detailed theoretical analysis of spin degrees of freedom in carbon isotopes is performed, probing them by electron scattering, pion photoproduction and radiative pion capture from the mesoatomic orbits. | (e, e′), (γ, π^+ and (π^−, γ) on^12C and^13C | null |
1991-10-01 | Electron spin resonance (ESR) and optical absorption spectra of Cu^2+ ions in Na_2SO_4-ZnSO_4 glasses have been studied. The ESR spectra of Cu^2+ ion-doped glasses exhibited a pronounced peak at g =2.07 and a shallow quadruplet at g =2.35, the latter arising from the hyperfine splitting of g_∥. ESR spectra of Cu^2+ ion... | Electron spin resonance and optical absorption spectra of Cu^2+ ions in Na_2SO_4-ZnSO_4 glasses | null |
1991-06-01 | When is the numerical value of the critical point changed by an enhancement of the process or of the interaction? Ferromagnetic spin models, independent percolation, and the contact process are known to be endowed with monotonicity properties in that certain enhancements are capable of shifting the corresponding phase ... | Strict monotonicity for critical points in percolation and ferromagnetic models | null |
1991-03-01 | Left-right asymmetries in atomic transitions, depending upon the nuclear spin, could be a source of information on the neutral hadronic axial current. We show that the relevant electroweak parameter can be extracted from experiment by measuring hyperfine component ratios which do not involve the knowledge of the atomic... | Nuclear spin dependent atomic parity violation, nuclear anapole moments and the hadronic axial neutral current | null |
1991-02-01 | In this paper I speculate upon the potential of muon spin rotation/relaxation/resonance (μSR) for future refinement and/or exploitation at large accelerators like KAON, which might generate muon beams a hundred times more intense than today's best. Several schemes for efficient utilisation of such beams might be well w... | μSR at new accelerators | null |
1991-01-01 | Photochemical reaction paths tend to pass through biradicaloid geometries, making a detailed understanding of the electronic states of molecules at such geometries highly desirable. The simplest model that correctly describes their fundamental features, the two-electron two-orbital model, is reformulated in a way that ... | The States of an Electron Pair and Photochemical Reactivity | null |
1991-01-01 | Momentum-resolved photoemission has over the past decade developed into a mature tool for the study of two-and three-dimensional electronic states at surfaces and in thin films. Though not all complexities of the emission process have yet been fully incorporated into the analysis of photoemission spectra (one such prob... | Spin-Resolved Photoemission | null |
1991-01-01 | Universal conductance fluctuations (UCF) are a novel quantum interference effect in small, weakly random systems which cleanly demonstrate the importance of electron phase coherence at low temperatures (Lee, Stone, and Fukuyama, 1987). Recently, much attention in the study of UCF has been focused on the effects of magn... | Effect of Spin-Orbit Scattering on the Mesoscopic Conductance Fluctuation Amplitude in GaAs/AlGaAs Heterojunctions | null |
1991-01-01 | Having investigated the significance of lowest-order covariant Feynman “tree” (no loop) diagrams for strong, electromagnetic, and weak interactions, it is quite natural to try to extend the approach to the fourth fundamental force, that of gravity. The problem is that the gravitational interaction is so weak that quant... | Lowest-Order Gravitational Interactions | null |
1991-01-01 | Bis(phthalocyaninato) lanthanide sandwich compounds have been synthesized for ytterbium and thulium. Low temperature magnetic susceptibility data suggest a strong antiferromagnetic interaction between the lanthanide f-electrons and the phthalocyaninato ligand radical electron. | BIS(Phthalocyaninato) Lanthanide Sandwich Compounds Exhibiting Mixed Valence Ligands | null |
1991-01-01 | Semimagnetic IV–VI compounds have been studied for about a decade. Nevertheless the amount of knowledge which has been accumulated is much less than compared to the situation in A _1-X ^II Mn_XB^VI or A _1-X ^II Fe_XB^VI alloys. The complications due to the many valley band structure, the fact that the band edge functi... | Semimagnetic IV–VI Compound Semiconductors | null |
1991-01-01 | The low-energy part of the He(Iα) or He(IIα) PE spectrum of a hypothetical molecule M (shown in Fig. 1) consists of four bands, ① to ④, which — for simplicity — we assume not to overlap. The bands ① and ② exhibit resolved vibrational fine structure, whereas the fine structure of ③ and ④ cannot be resolved because of li... | The Equivalent Bond Orbital Model and the Interpretation of PE Spectra | null |
1991-01-01 | Proton rings have the potential capability of accelerating polarized proton beams. This capability has been explored and utilized at Saclay, Argonne and then at Brookhaven for energies up to the order of 20 GeV. The difficulty lies in accelerating the beam, without loss of polarization, through a number of spin resonan... | What is Needed to Accelerate Polarized Beams in Large New Proton Rings | null |
1991-01-01 | A complete set of polarization transfer coefficients ( D _ ij ), as well as differential cross section, analyzing power ( A _ y ), and induced polarization ( P ), are now available^1,2 for the 4^- “stretched” T = 0 and T = 1 transitions in ^16O( $$\left( {\vec{p},\vec{p}'} \right)$$ )^16O at E _p = 200 MeV. These trans... | Modifications of the Effective Isovector Interaction from Studies of (
$$\left( {\vec{p},\vec{p}'} \right)$$
) Polarization Transfer | null |
1991-01-01 | The influence of electron correlation on interference effects in energetic ion-atom collisions is analyzed. Electron-correlation phenomena are discussed in terms of dielectronic processes which are due to two-electron transitions produced by the electron-electron interaction. The collision systems are treated using the... | Interference and correlation in energetic ion-atom collisions: The role of dielectronic processes | null |
1991-01-01 | It has now been almost ten years since a charged-particle polarimeter was first coupled to a high resolution spectrometer, the HRS at Los Alamos National Laboratory, for use at intermediate energies. During this time, polarimeters of similar design and comparable performance have been built at TRIUMF and at IUCF. Yet d... | Measurements of Polarization Transfer Observables in (
$$\left( {\vec{p},\vec{p}'} \right)$$
) Reactions at Intermediate Energies | null |
1991-01-01 | The workshop was a satellite meeting of the 9th International Symposium on High Energy Spin Physics, Bonn 1990 . It was the third in a row of similar workshops organised by Ch.K. Sinclair in Stanford 1983 [1] and in Minneapolis 1988 [2]. About fourty scientists from atomic, solid state, as well as high energy particle ... | Summary Report of the Workshop on Polarized Electron Sources and Electron Spin Polarimeters | null |
1991-01-01 | A brief sketch of the scattering scenario was presented earlier in Eqs.(3–83)-(3–90), in connection with the continuum solutions for a Dirac particle in a central potential. In this chapter we shall present a more detailed exposition of relativistic scattering for Dirac particles, various aspects of which apply to any ... | Dirac Scattering Theory | null |
1991-01-01 | Since the formulation of the periodic table by Mendeleev in the last century and its explanation in terms of atomic structure during the early part of this century, there has been a constant search for ways of accounting for the regularities and symmetries observed in nature’s building blocks. In the case of atoms a de... | The strong interaction | null |
1991-01-01 | The normal state properties of the cuprate superconductors are quite unusual, and depend strongly on the degree of doping. In the absence of electron-electron interactions, one would expect that the undoped systems would be simple metals, however it was found that the undoped systems are antiferromagnetic and insulatin... | Frequency Dependent Conductivity of High T_c Oxide Superconductors | null |
1991-01-01 | The experimental investigation of surfaces and interfaces with spectroscopy aims to the characterization of microscopic atomic and electronic order parameters which may clarify the fundamental implications of such macroscopic behaviours as contact potentials, Schottky barriers, surface magnetism, work functions. Synchr... | Synchrotron Radiation Spectroscopies: Spin Polarized Electron Yield in X-ray Absorption | null |
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