publicationDate stringlengths 10 10 | abstract stringlengths 0 37.3k | title stringlengths 1 5.74k | doi stringlengths 11 47 ⌀ |
|---|---|---|---|
1991-01-01 | In Sm-Fe-TM (TM: transition metal) systems, three new phases have been found, which show interesting hard magnetic properties. These new phases are prepared by non-equilibrium processing techniques as mechanical alloying or rapid quenching. In Sm-Fe-V with the ThMn_12 crystal structure coercivities up to 11.8 kOe, in S... | Intrinsic Properties and Coercivity of Sm-Fe-TM Phases | null |
1990-09-01 | Consideration of the expected two-quasiparticle structures and their estimated band head energies, and the selection rules for beta transition rates for the^154Nd →^154Pm →^154Sm decays are used to deduce the configurations for the isomers and the low-spin structures in the neutron rich doubly odd nucleus _61 ^154 Pm_9... | Characterization of isomers of the nucleus^154Pm | null |
1990-09-01 | Three natural hematites, α -Fe_2O_3, from the region of Elba have been investigated by means of ^57Fe Mössbauer spectroscopy at variable temperatures between 80 and 400K. The samples were selected on the basis of their different morphology as observed from powder X-ray diffraction and transmission electron microscopy. ... | Mössbauer effect study of the spin structure in natural hematites | null |
1990-09-01 | The temperature dependence of the thermoelectric power (TEP) of the solid solutions Ce_ x Y_1− x InCu_2 and CeInCu_ y Ag_2− y was measured between 1.2 and 300 K. The substitution of Y for Ce shows the Kondo origin of the giant TEP peak in CeInCu_2. Furthermore, the replacement of Cu by Ag allows us to follow both the s... | Thermpower of Ce_
x
Y_1−x
InCu_2 and CeInCu_
y
Ag_2−y
| null |
1990-08-01 | In^57Fe Mössbauer emission spectroscopy, the parent nucleus^57Co is incorporated in the matrix by diffusion, implantation or co-precipitation. Mössbauer emisssion spectra often differ from the corresponding absorption spectra in several aspects. The “anomalous” features (denoted as “after-effects” of nuclear transforma... | Mössbauer emission spectroscopy of metastable electronic states | null |
1990-07-01 | After effects following nuclear transformation have been extensively studied in a large variety of matrices by Mössbauer Emission Spectroscopy (MES). The branching ratios of transient atomic charge states and energetically unstable states of the environment, excitations of electronic ligand field states and populations... | Advances in Mössbauer Emission Spectroscopy | null |
1990-07-01 | CdCr_2 x In_2−2 x S_4 spinels show spin glass and reentrant properties. The quadrupole splitting variations with composition and temperature are determined from paramagnetic spectra and interpreted from crystal field theory and partial quadrupole splitting treatment. | Quadrupole splittings and hyperfine fields in CdCr_2x
In_2−2x
S_4 spin glass system | null |
1990-06-01 | The high spin structure of the nucleus^129Ba has been investigated using a^18O induced reaction. The known bands could be followed up to a maximum spin (55/2) ħ. Some 56 states and 78 transitions could be placed in the level scheme. Band crossings were established in both positive and negative parity structures. They d... | High spin states in^129Ba | null |
1990-06-01 | The results of diffraction experiments, of X-rays to give charge density and of polarised neutrons to give spin density, are compared between themselves and with the theoretical density obtained by a local density unrestricted Hartree-Fock calculation. The systems studied include in particular the archetypal M(CN) _6 ^... | Charge, spin and theoretical densities in transition metal complexes | null |
1990-05-01 | The effects of composition and substrate temperature during evaporation and annealing, on the electron spin resonance spectra of co-evaporated SiO_ x /SnO (300 nm) thin films have been investigated. The spin density is observed to decrease with increasing SnO content. This effect is attributed to the saturation of some... | The effect of composition, substrate temperature and annealing on the paramagnetic centres in SiO_
x
/SnO co-evaporated thin films | null |
1990-03-01 | Nonrelativistic and quasirelativistic ab initio pseudopotentials substituting the M^(Z−28)+-core orbitals of the second row transition elements and the M^(Z−60)+-core orbitals of the third row transition elements, respectively, and optimized (8 s 7 p 6 d )/[6 s 5 p 3 d ]-GTO valence basis sets for use in molecular calc... | Energy-adjustedab initio pseudopotentials for the second and third row transition elements | null |
1990-03-01 | Analysis of the hyperfine interaction in the ESR spectra of π radical anions of zinc chlorins | null | |
1990-03-01 | The phase diagram of the one-state Potts model on the closed asymmetric Cayley tree with branching ratio r =2 is obtained from the Bethe-Peierls map. The route to chaos, via the period doubling cascade, is obtained by considering the antiferromagnetic coupling limit. The connection of the Potts model with the percolati... | Phase diagram of the one-state potts model on the Cayley tree | null |
1990-02-01 | Electron spin resonance (ESR) spectra of Gd^3+ ions doped in K_2SO_4-ZnSO_4 glasses have been studied on an X-band ESR spectrometer at different temperatures (−120 to 150‡ C). The ESR spectrum at room temperature exhibits three prominent features with effective g -values of ∼5.6, 2.83 and 2.02. The spectra are similar ... | Electron spin resonance spectra of Gd^3+ ions in K_2SO_4-ZnSO_4 glasses | null |
1990-01-01 | One of the most important developments beyond the original concept of magnetic resonance is so-called double resonance in which, as the name suggests, one excites one resonant transition of a system while simultaneously monitoring a different transition. There are many reasons for doing double resonance. The goals incl... | Double Resonance | null |
1990-01-01 | Very detailed EPR spectra have been recorded for manganese (II) pairs in MgO and CaO. Manganese (II) enters substitutionally the host crystals: at concentrations of about 1% appreciable numbers of isolated pairs are found which were characterized at three frequencies (15.5, 24.5, and 35.5 GHz) over the temperature rang... | Selected Examples of Spectra of Pairs | null |
1990-01-01 | When a beam of electrons with energies greater than several hundred eV is incident upon a ferromagnetic metal, spin polarized secondary electrons are emitted. The polarization of these secondary electrons is related to the polarization of the electrons in the ferromagnet. In the case of transition metal ferromagnets, t... | Scanning Electron Microscopy with Polarization Analysis: Studies of Magnetic Microstructure | null |
1990-01-01 | The pressure-temperature phase diagram of the Bechgaard salts (TMTSF)_2X, where TMTSF is tetramethyltetraselenafulvalen and X = PF_6 ^−, ClO_4 ^−, ReO_4 ^− etc., is marked by the existence of both spin density wave (SDW) and superconducting phases [1]. Both phases are also observed in the magnetic field-temperature pha... | Absence of Field Induced Spin Density Wave Transitions in (TMTSF)_2NO_3
| null |
1990-01-01 | The electromagnetic field of the incident photon alters the self-consistent potential in which the atomic electrons move. As a result, the photoionization amplitude becomes the sum of two terms. The first of these arises from the electron being removed by means of its direct interaction with the electromagnetic field, ... | The Random-Phase Approximation with Exchange | null |
1990-01-01 | Nuclei that lie in the transition region between those that display pure single-particle and pure collective behavior at low spins tend to yield to the fictive forces generated by rotation and undergo structural changes. The role of angular momentum in stabilizing exotic shapes in nuclei has been dramatically demonstra... | Spin-Stabilized Deformation in Transitional Nuclei | null |
1989-06-01 | Based on the spin-polarized version of the multiple scattering theory, a relativistically correct formulation for the Green’s function describing the electronic structure of magnetic metallic systems has been derived. By this way, orbital contributions to the magnetic moment and, for the first time, to the hyperfine fi... | A fully relativistic description of the hyperfine interaction in magnetic systems | null |
1989-06-01 | The temperature and pressure dependence of the quadrupole splitting Δ E _Q of the 3/2→1/2 nuclear Mössbauer transition of^57Fe in the spin crossover compounds [Fe_ x Zn_1− x (2-pic)_3]Cl_2⋆EtOH and the deuterated analog [Fe_ x Zn_1− x (2-pic-ND_2)_3] Cl_2⋆EtOD (2-pic=2-picolylamine) have been studied. The change of Δ E... | Quadrupole splitting of Fe(II) spin crossover compounds study of temperature and pressure dependence and the implication for the interaction mechanism | null |
1989-06-01 | The electron spin polarization (ESP) at surfaces of bulk and artificially structured, thin film magnetic materials is studied using electron capture spectroscopy (ECS) and ion-induced emission of spin-polarized electron. For V and Tb surfaces, it is found that the temperature dependence of the surface magetic order is ... | Studies of novel magnetic systems by electron capture spectroscopy (ECS) | null |
1989-06-01 | Mössbauer absorption spectra have been measured for Cr^3+ doped Al_2O_3−Fe _2 ^57 O_3 systems for different values of the Cr^3+ concentration at room temperature. The cross relaxation between Fe^3+ and Cr^3+ ions, which destroys the paramagnetic hyperfine structure of Fe^57 observed in undoped Al_2O_3−Fe _2 ^57 O_3, is... | Relaxation phenomena in Cr^3+ doped Al_2O_3−Fe
_2
^57
O_3 systems | null |
1989-04-01 | A brief review of the Hartree-Fock approximation to nuclear shapes and nuclear spectra is presented. Various aspects of rotation-alignment effect and high spin states are illustrated in the Hartree-Fock model. | Hartree-Fock theory of nuclear deformations and high spin states | null |
1989-04-01 | Polycrystalline samples of cation-deficient FeAl_2O_4 spinel with Fe^3+ ions and vacancies on both octahedral and tetrahedral sites have been investigated by electron spin resonance (ESR). For samples annealing at 1100° C and slightly oxidized (⩽0.16 wt % Fe^3+), the ESR spectrum originates from Fe^3+ ions located in t... | ESR characterization of Fe(III) ions in polycrystalline cation-deficient FeAl_2O_4 spinel | null |
1989-03-01 | A previously developed scheme for describing the effects of substituents on the physicochemical characteristics of molecules with conjugated bonds has been extended to systems with an open electron shell. The distribution of spin density has been found for a number of anion radicals of azines on the basis of a calculat... | Accounting for effects of AZA-substitution on hyperfine interaction constants in ESR spectra | null |
1989-01-01 | The basic ideas, mathematical structure and manifestations of the first order Jahn—Teller couplings are introduced with special emphasize on inorganic complexes. | A Plain Introduction to Jahn—Teller Couplings | null |
1989-01-01 | The free Schrodinger equation for collective multipole degrees of freedom is linearised so that energy and momentum operators appear only in first order. The wave functions solving the linearised equation carry a collective spin depending on multipolarity. For nuclear quadrupole surface degrees of freedom a scalar coup... | The Collective Spin of Nuclear Surface Vibrations | null |
1989-01-01 | Astrophysical constraints on the equation of state are imposed by three sources, (1) masses of neutron stars, (2) rotational frequencies of very fast pulsars (neutron stars), and (3) supernovae. Of the three, the theoritical and observational status of the first is most secure. For the second, a half millisecond pulse ... | Neutron Stars, Fast Pulsars, Supernovae and the Equation of State of Dense Matter | null |
1989-01-01 | Soil chemists have long-recognized that knowledge of the elemental composition of soils is generally of little use in assessing the availability of these elements to plants. An obvious illustration of this principle is the common occurrence of Fe and Mn deficiency in plants despite the relatively high levels of Fe and ... | Reactions Controlling Heavy Metal Solubility in Soils | null |
1989-01-01 | Einstein Observatory IPC and HRI observations of a serendipitous, variable, X-ray source in the galactic plane in Carina are presented. Timing analysis shows the source to have a periodicity P ~ 60 msec. The optical identification with the 12.7 mag Wack 2134 star, suggested by the positional coincidence, is confirmed b... | A New 60-msec X-Ray Pulsar and Its Massive Early-Type Companion | null |
1988-09-01 | The triplet-instability analysis of the closed-shell RHF solutions has been carried out in relation to the orbital and spin correlation effects for various transition structures (TS) and reaction intermediates. It is found that the RHF solutions even for cyclic transition states of the Woodward-Hoffmann symmetry-allowe... | Extended Hartree-Fock (EHF) theory of chemical reactions | null |
1988-09-01 | Solution of problem of determining spin properties of molecules in unitary formalism of quantum chemistry | null | |
1988-07-01 | The spin hydrodynamic equations for superfluid^3He-A for the case of external, time-dependent fields are considered. The terms in equations containing these fields are found on the basis of a microscopic approach. Considering the linear response of the system to the switching on of external fields, formulas are found f... | Green's functions for superfluid^3He-A in the case of spin hydrodynamics: Influence of the spin-orbit coupling | null |
1988-01-01 | Magnetic resonance has made significant contributions to the characterisation of point defects and small aggregates in semiconductors. A particularly clear demonstration of the potential of this technique is provided by research on transition metals in silicon. Basic atomic and electronic structural information of thes... | Transition metal impurities in silicon | null |
1988-01-01 | >We review a conceptual picture of Mott insulators, based on strong orbital as well as spin polarization in unrestricted Hartree-Fock, theory, with screened intra-atomic parameters. This picture is used to interpret recent works. The mechanism for the breakdown of local-density band theory is carefully discussed. | Theory of Mott Insulators | null |
1988-01-01 | The purple acid phosphatases comprise a group of proteins distinguished by their enzymic activity, distinctive color and, most importantly, the presence of a spin-coupled binuclear iron center. This center exists in two stable interconvertible states: pink, reduced, EPR-visible and enzymically active, with an antiferro... | The binuclear iron centers of uteroferrin and the purple acid phosphatases | null |
1988-01-01 | The low-spin β -decay of ^96,98Y has been reinvestigated to obtain detailed information on the fast first-forbidden transitions to the ground states of ^96,98Zr. A considerably more detailed decay scheme of ^96Y confirms the general features of a previous study. The spin of the ground state of ^98Y has been measured to... | Fast First-Forbidden Transitions and Subshell Closures in the Region of ^96Zr | null |
1988-01-01 | The rapid development of computational facilities and of increasingly efficient, highly sophisticated quantum chemical methodologies and programs has certainly reached a point now, where ab initio calculations for small molecules, composed of light atoms, appear to provide numerically accurate predictions of structures... | Organometallic Reactivity and Applied Quantum Chemistry — Some Aspects of CH-Activation | null |
1988-01-01 | Several speakers at this conference have shown that spin observables can uncover subtle effects that are otherwise hidden in the study of unpolarized phenomena. In this contribution results will be presented that show important modifications to spin observables once the explicit energy dependence of the effective nucle... | Energy Dependent Corrections to Spin Observables in Nucleon-Nucleus Scattering | null |
1988-01-01 | In this review we present the evidence for the prevalence of the GT (Gamow-Teller) transition mode amongst the allowed beta ( β ) nuclear transitions. It is shown that the number of strong F (Fermi) transitions is limited to about thirty cases in the light nuclei, A < 40. These constitute the so-called super-allowed ( ... | On the Prevalence of the Gamow-Teller Transition | null |
1988-01-01 | Motivated by the recent development of Scanning Electron Microscopes with secondary electron spin polarization analysis for magnetic surface domain structure imaging, we review the present understanding of the emission of spin-polarized secondary electrons. In particular, the following points are discussed: (i) the rel... | Spin-Polarized Secondary Electrons from Ferromagnets | null |
1988-01-01 | Using the second quantization method, we introduce the supergroup U(2^81+4) for the nucleon LS-coupled shell S = {(nl)^N}. Then by use of the method to obtain Lie subalgebras and the method of coupled tensor operators, we get its subgroups and its subgroup structures.In this way we describe the complete symmetries of t... | Symmetries in nuclei | null |
1988-01-01 | A search of reversible steps in photochemical reactions of uranyl ion seems to be an important problem of photochemistry and magnetochemistry. The present poster is devoted to the CIDNP study in the reactions of photoexcited uranyl ions with phenols (∅OH) and benzylic acid in methanol-d_4. The following OOH have been u... | Cidnp in the Reactions of Photooxidation of Benzylic Acid and Phenols Sensitized by Uranyl Ion | null |
1988-01-01 | What follows is a brief account of some of the results of studies of the ( n, p ) reaction on nuclear targets initiated at TRIUMF in December 1985. The close connection between studies of nucleon charge exchange reactions and spin excitations in nuclei has been a central theme of earlier conferences held here at Tellur... | The (n,p) Reaction as a Probe of Nuclear Structure | null |
1988-01-01 | The measurement of spin observables represents an important tool to investigate specific effects that are not easily observed with the measurement of spin integrated cross sections.Examples of that are: 1) the study of the energy dependence of spin observables in pp scattering that show structures, that have been inter... | Spin Observables in
$$\overline {PP}$$
Elastic and PP Inelastic Scattering | null |
1988-01-01 | In this paper we concentrate on a region of the nuclear response that lies higher in excitation energy than the previously discussed nuclear resonance region and quasifree region. Figure 1 shows one of the main results of the Saturne charge exchange experiments from a couple of years ago^1). The spectra show how the ch... | Charge Exchange Reactions at Saturne | null |
1988-01-01 | The basic problem we study here is whether the two-spin correlation experiments together with the theoretical Bell inequalities have already excluded the possibility of introducing hidden variables into quantum theory, as is often concluded. This question is answered negatively by explicitly reproducing the quantum-mec... | Explicit Calculations with a Hidden-Variable Spin Model | null |
1987-12-01 | Previously reported potential curves for 0 _ g ^− (^3 P _0) and 0 _ u ^− (^3 P _0) of Ne_2 obtained from large-scale configuration-interaction calculations supplemented by semiempirical spin-orbit calculations are compared with potential curves deduced from experimental studies by Beyer and Haberland. Although the agre... | Theoretical studies on excited states of Ne_2
| null |
1987-12-01 | Electron spin resonance (ESR) and optical absorption spectra of K atoms embedded in Ar matrices have been measured simultaneously. ESR and optical spectra could be correlated comparing the effects of annealing and light induced site modifications. Electron spin relaxation times were estimated by saturation measurements... | Correlation of electron spin resonance and optical absorption of K atoms in solid Ar | null |
1987-06-01 | Time-resolved EPR investigation of very short-lived triplet states of azaaromatics | null | |
1987-03-01 | The phenomenon of temperature-dependent spin transition will be introduced and the numerous chemical and physical influences affecting the spin transition characteristics will be discussed. We shall mainly concentrate on the spin crossover system [Fe(2-pic)_3]X_2·Sol (2-pic=2-aminomethylpyridine; X=Cl, Br; Sol=C_2H_5OH... | Spin transition in iron(II) complexes induced by heat, pressure, light, and nuclear decay | null |
1987-01-01 | In this section we shall consider the mission aspects of placing a satellite into transfer orbit. Two main activities arise, that of selecting the launch vehicle appropriate to the satellite and the mission, and that of assessing the launch window. In fact the first activity usually occurs the other way around! Because... | Launch | null |
1987-01-01 | Trischelated complexes with bidentate ligands containing a π-conjugated bridge may show a pronounced trigonal splitting of the t_2g orbitals. As has been pointed out by Orgel (1961) this splitting is due to the electronic interaction between the ρπ-orbitals of the ligator atoms via the conjugated bridge. An extended an... | Ligand Field Analysis of the Doublet Excited States in Chromium(III) Trischelated Complexes | null |
1987-01-01 | A method for obtaining polarized antiprotons in LEAR via the separation of opposite-spin states is suggested. The method can be tested with protons circulating in the same machine. | A Spin Splitter for Antiprotons in LEAR | null |
1987-01-01 | After a critical discussion concerning the status of the art in charge and spin density determination, by use of X-Ray and neutron Bragg diffraction, two examples are discussed in detail. The charge density in molecular crystals containing short S…0 non bonded contacts has been obtained experimentally and theoretical r... | Charge and Spin Densities in Molecular Solids: Local Density Functional Calculations Versus Experiment | null |
1987-01-01 | Magnetic properties are often very different at the surface compared to the bulk. The inherent breaking of the symmetry at the surface, compositional and structural changes as well as surface adsorbates are possible causes of surface induced magnetic changes. The complex phenomena associated with magnetism at surfaces ... | Magnetism at Surfaces and Spin Polarized Electron Spectroscopy | null |
1987-01-01 | Two properties^1,2 of heavy fermion systems are particularly intriguing: the unusual superconducting states, and the sensitivity to impurity doping. Strong evidence^3 now exists for an anisotropic superconducting order parameter which vanishes at certain regions of the Fermi surface in UBe_13 and UPt_3. For (U_1−xTh_x)... | Effects of Thorium Doping in (U, Th)Pt_3, and (U, Th)Be_13
| null |
1987-01-01 | In many cases, lattice or spin modulations show a hyster-etic motion. The possible origins of the solid friction responsible for this behaviour are two-folds: lattice friction on weakly commensurate modulations. friction due to lattice defects on uncommensurate modulations. | Solid Friction on Lattice and Spin Modulations | null |
1987-01-01 | In the course of our studies on the thermally induced high spin (HS) ↔ low spin (LS) transition in iron(II) complexes /1/, $${\!^5{\text{T}}_2}_{\text{g}}$$ ↔ $${\!^1{\text{A}}_1}_{\text{g}}$$ in the approximation of O_h symmetry, we have observed in 1984 a new photophysical effect /2/: If, at sufficiently low temperat... | Light-Induced Excited Spin State Trapping in Iron(II) Complexes | null |
1987-01-01 | The wave function of the system “electron + atom” depends upon electronic coordinates r_1 ... r_N and spin projections μ_1 ... μ_N. It should be antisymmetric with respect to the permutation of any pair r_iμ_i and r_kμ_k. Denoting by one quantity x_i all variables r_iμ_i and by P_ik the permutation operator, we have 1.... | Collisions of Electrons with Atoms and Ions: General Theory | null |
1987-01-01 | We discuss the polarization of stored antiproton beams by spatially separating particles with opposite spin directions, using the Stern-Gerlach effect in alternating quadrupole fields. | Polarization of Stored Antiprotons by the Stern-Gerlach Effect | null |
1987-01-01 | Let us recapitulate some basic facts about the fusion reactions initiated by muons in a chamber of hydrogen isotopes. | Theory of Cross-Section for Formation of Meso-Molecules | null |
1987-01-01 | The earmark of the intermetallic compounds known as heavy-Fermion or heavy-electron materials is a low-temperature linear electronic specific-heat coefficient (γ) which shows an upturn on cooling to low temperatures, typically below 4 K (Fig. 1). It is clear from data on the gap anomaly of heavy-electron superconductor... | Heavy-Electron Materials | null |
1987-01-01 | When I chose the title for this talk I had expected to say general things about the overall mixed valence problem and its rather fascinating history, and to leave the question of its present and future to the rest of you. In the course of discussions with quite a number of people, however, I came to the realization tha... | Where are We in the Mixed Valence Story? | null |
1987-01-01 | From its former position as a mathematical curiosity, study of the positronium atom (Ps) has gradually evolved into a subject of quite active experimental and theoretical interest. Ps, especially in the ortho (triplet spin) state, is relatively long-lived and can be considered just like any ordinary atom in most of its... | Theoretical Aspects of Positronium Collisions | null |
1986-09-01 | Future prospects for chemically induced magnetic polarization in free radical reactions | null | |
1986-09-01 | High spin states in^176, 178Re have been studied using in-beam γ and e^− spectroscopy techniques through heavy ion induced fusion reactions. A ΔI=2 rotational band of doubly decoupled type has been identified in each isotope. | Doubly decoupled bands in^176, 178Re | null |
1986-01-01 | All of the ions considered in Chap. 11 were those for which the ground state is orbitally nondegenerate. The deviations of the g factors from g _ e are adequately described by the use of second-order perturbation theory. In Chap. 12 we encounter examples in which the crystal field does not completely remove the orbital... | Transition-metal Ions. II. Electron Resonance in the Gas Phase | null |
1986-01-01 | Electron spectroscopies have been playing a vital role in the development of surface science over the past two decades. Information on the sample has mostly been obtained from the energy and angular distribution of emitted or scattered electrons, while the “spin” property has been exploited to a much lesser extent. Thi... | The Use of Spin-Polarized Electrons in Surface Analysis | null |
1986-01-01 | The ESR spectra of the pentacyanocobaltate(II) anion within its salts with Li^+, Na^+, K^+, and [KL]^+ cations, where L is a macrocyclic polyether, in various solvents have been obtained and analyzed. The spin density in the 3d and 4s orbitals of cobalt and the isotropic hyperfine coupling constants have been calculate... | ESR investigation of the electronic structure of the pentacyanocobaltate(II) anion in solutions | null |
1986-01-01 | In this chapter we shall apply the formalism of effective operators, introduced in the previous chapter, to the hyperfine interaction. The idea of using effective operators to analyze experimental hyperfine data has gradually developed over the years. It has long been known that a significantly improved fit to the expe... | The Hyperfine Interaction | null |
1986-01-01 | In the last two chapters we have applied the central-field model mainly to systems with two electrons in open shell(s). The extension to more general systems provides no fundamental difficulty. Using the standard technique of Condon and Shortley [1935], described in Chap. 5, one can set up the matrix of the Hamiltonian... | Many-Electron Wave Functions | null |
1986-01-01 | We discuss some features of strained superlattices, built with III-V semiconductors s we describe their structure and we show how to include the strain effects in an envelope function-type model of the band structure. These properties are illustrated by experimental results (mainly optical data) obtained on such strain... | Strained Superlattices | null |
1986-01-01 | The time resolved ClO_2 Ã(^2A_2)(0,0,0) →X̃(^2B^1)(0,0,0)) fluorescence excited with the 4765 Å single mode argon- ion laser line leads to two distinct lifetimes corresponding to the spin states Fl(N=J+l/2) and F2(N=J−l/2) with tl=(56±20) ps and t2=(336±27) ps respectivily. Our tl- value is in good agreement with the t... | Experimental Determination of the ClO_2 - Ã(^2A_2) (0,0,0) Predissociation Lifetime | null |
1986-01-01 | Fe is the most common magnetic impurity in InP and we have examined its contribution to the phonon scattering as part of a programme of investigation of scattering by transition metal ions in the III–V’s. In InP, Fe substitutes for In and enters as Fe^3+ which is expected to be a very weak scattering centre because of ... | Phonon Spectroscopy of Iron Doped InP | null |
1986-01-01 | If the interaction of an electron with a magnetic field were the only effect operative, then all ESR spectra would consist of one line. The only useful information to be garnered from these spectra would be the g factor. The ESR technique would thus provide rather limited information. Fortunately there are other intera... | Nuclear Hyperfine Interaction | null |
1986-01-01 | Within the V - A theory for the charged weak current the ß decay of the free neutron, n → peν ̄ _ e , is determined by momentum-independent vector and axial-vector weak coupling constants g _ V and g _ A . The neutron-spin-electron-momentum angular correlation is sensitive to g _ A /g _ V ; a recent experiment at the r... | Axial-Vector Weak Coupling Constant g_A and Quark Confinement in Nucleons | null |
1986-01-01 | Electron paramagnetic resonance experiments have been carried out on luminescent crystals of CaMo0_4, YVO_4 and Ba_3(VO_4)_2 at liquid helium temperature. The results prove that the luminescence originates from a spin triplet of the tetroxo ion, in accordance with a suggestion by Blasse. The zero-field splitting tensor... | Conformational Changes on Excitation of Mn0_4
^- Type d° Tetroxo Anions in Crystals | null |
1986-01-01 | It is a truism that the more we learn about anything the more complex that subject becomes. This is especially true of our understanding of the exact arrangement of atoms or ions which make up solid materials.The rapid development and improvement of the techniques by which defects solids are detected and characterized,... | Introduction to Defects in Solids | null |
1986-01-01 | This chapter consists of two parts. In Section 8.2 the concept of impurity band and the phenomena of impurity conduction characteristic of the impurity band are first described. Then, in connection with the analysis of impurity conduction, in particular the metal-insulator transition in doped semiconductors, the histor... | Impurity Bands | null |
1986-01-01 | It is pointed out that the gauge principle which by now plays a decisive role in many domains of physics is based on a most natural mathematical, or, better geometrical view-point. In fact, all fundamental interactions known so far are due to this principle. It is stressed, in particular, that, according to our recent ... | The Gauge Principle in Modern Physics | null |
1986-01-01 | This chapter illustrates some of the characteristic features by which quantum mechanics differs from classical theories. In Section XIII.1, using a gedanken experiment with the Stern-Gerlach apparatus it is shown that a polarized beam (a pure state) cannot be split by the magnetic field, and that the splitting of such ... | Some Fundamental Properties of Quantum Mechanics | null |
1986-01-01 | Ab initio configuration interaction (CI) calculations are reported for different electronic configurations of the two model iront II) porphyrin complexes, the four-coordinate FeP molecule and its dioxygen complex FePO_2, in order to assign the ground state configurations. For FeP (in an intermediate spin state S=l) the... | Electronic Structure of Metallloporphyrins. Ab Initio CI Calculations | null |
1985-12-01 | 1. A number of new square planar o-semiquinone complexes of rhodium(I) with neutral ligands have been synthesized. 2. A clearly expressed dependence of the frquency of the M-SQ charge-transfer band on the nature of the neutral and SQ ligands in square complexes of rhodium(I) has been discovered. 3. An evaluation of the... | Investigation of the electronic structure of o-semiquinone complexes of rhodium by ESR and electronic spectroscopy | null |
1985-11-01 | This paper reviews the application of the perturbed angular correlation (PAC/D) technique to studies of rare earth hyperfine interactions. First, PAC/D measurements of the interaction of rare-earth nuclei with the large hyperfine fields of their own partially filled 4f electronic shell are discussed. It is shown that P... | Rare earth hyperfine interactions studied by perturbed angular correlations | null |
1985-09-01 | Using the example of interactions with an external electromagnetic field, we consider the physical basis of describing fermions with spins 1/2 by means of a system of differential equations for a set of tensor fields (the Dirac-Kähler equations). | Particles with variable spin in an external electromagnetic field | null |
1985-07-01 | The g -tensor theory of low-spin d ^5 configuration in octahedral fields having axial (tetragonal or trigonal) and rhombic distorsions is summarised. Illustrations taken from literature concern the following ruthenium(III) species: Ru(H_2O) _6 ^3+ (trigonal), Ru(bpy) _3 ^3+ (trigonal), the Creutz-Taube cation (axial + ... | Electron spin resonance studies of distorted octahedral ruthenium(III) species | null |
1985-01-01 | The polarization of electron/positron beams in storage rings is fundamentally governed by the quantized nature of synchrotron radiation. On the one hand, beams can become polarized by the Sokolov-Ternov spin-flip asymmetry of the photon emission, whereas on the other hand, the abrupt energy loss excites orbit oscillati... | Polarized Beams in High-Energy e^+e^- Storage Rings | null |
1985-01-01 | Polarized electrons can be produced by photoionization of polarized atomic beams, which have high intensities when produced by six-pole magnets. The process has been investigated mainly with a view to building a source of polarized electrons. | Polarized Electrons by Ionization Processes | null |
1985-01-01 | In this chapter we present and discuss experimental results obtained from magnetic materials. First, we treat elastic and inelastic electron scattering from crystals and amorphous metals (Sect. 5.1). In Sect. 5.2 electron emission spectroscopies are presented, by means of which the exchange-split electronic structure o... | Results from Magnetic Materials | null |
1985-01-01 | This chapter aims at providing an overview of collective magnetism in noncrystalline solids. It is descriptive in outlook, and sets out to relate some of the key ideas of amorphous magnetism to well-established concepts of magnetism in crystalline solids, stressing the points where something new emerges because of the ... | Magnetism in Amorphous Solids | null |
1985-01-01 | In this and the following chapter the results of electron scattering and electron emission experiments with magnetic and non-magnetic solids are presented. We shall treat spin-orbit and exchange interaction separately, though from a physical point of view this separation is somewhat artificial since both types of inter... | Results from Non-Magnetic Crystals | null |
1985-01-01 | Experimental analysis of the photoelectron-spin polarization vector in photoionization using circularly polarized light (Fano effect^1) was up to 1984 restricted to angle-integrated measurements^2 without resolution of the kinetic energy of the photoelectrons corresponding to different ionic states. With the developmen... | Angle- and Spin-Resolved Photoelectron Spectroscopy | null |
1985-01-01 | The discovery that interaction effects with disorder give anomalous correction terms^1 to the normal Fermi liquid behaviour of an electron system has changed in the last few years our views on the possible interpretations of the metal-insulator transition in the various cases. One cannot advocate any more either the An... | Metal-Insulator Transition and Landau Fermi Liquid Theory | null |
1985-01-01 | Baryons in the quark model | null | |
1985-01-01 | The interplay between electron localization and superconductivity is discussed for two-dimensional and three-dimensional systems. In the two-dimensional case (thin films) theory and experiments on T_c depression, critical field and the effect of superconductivity fluctuations are reviewed and compared. In the three-dim... | Localization and Superconductivity | null |
1985-01-01 | The Fermi liquid theory of Anderson lattices is developed to describe coherent states of Kondo lattices at low temperatures. The origin of heavy electrons is the spin fluctuation nearly confined within each single f site; the situation is similar to that in dilute Kondo alloys. On the basis of the Fermi liquid theory, ... | Superconductivity in Kondo Lattices | null |
1985-01-01 | Electron spin resonance (ESR) spectroscopy at low temperatures can provide detailed electronic and magnetic properties of reactive molecules, such as their multiplicities, zero-field splittings, and hyperfine interaction constants. This has proved to be particularly valuable in the study of small transition metal molec... | Molecular Information from ESR Spectra: Transition Metal Molecules | null |
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