publicationDate stringlengths 10 10 | abstract stringlengths 0 37.3k | title stringlengths 1 5.74k | doi stringlengths 11 47 ⌀ |
|---|---|---|---|
1979-11-01 | Si descrive lo scopo della missione degli ISEE ponendo in evidenza i nuovi aspetti che probabilmente la rendono significativa nella comprensione della fisica magnetosferica. Si spiega il ruolo dei 3 satelliti. Si presenta brevemente la filosofia schematica dei satelliti stessi, seguita da una descrizione degli strument... | The international sun-earth explorer mission | null |
1979-11-01 | The effect of Coqblin-Schrieffer-type interaction between conduction and rare-earth ion localized electrons on the superconducting order parameter δ of some ternary compounds is studied. A reentrant behavior of the order parameter is found. Superconductivity can be destroyed at two temperatures: at T _c1 due to thermal... | The effect of magnetic ordering on superconducting pairing in some rare-earth compounds | null |
1979-06-01 | Copper influences the electrical and optical properties of zinc oxide to a high degree. Previously this has been explained within the frame of a model assuming Cu^++ ions to be substitutional for divalent zinc. The observation of additional signals in the Electron Spin Resonance spectrum, however, proved this assumptio... | Electronic structure of copper in zinc oxide | null |
1979-03-01 | The low lying high spin states in the transitional odd-odd mass nuclei are studied systematically in the framework of gamma deformed rotor model. The two odd particles, a proton and a neutron, are treated as the BCS quasi particles moving in a triaxially deformed field. The calculations are confined to small β -deforma... | Study of transitional odd-odd mass nuclei | null |
1979-01-01 | Inorganic chemistry is concerned with the chemistry of over an hundred elements, forming compounds whose stability ranges from that of mountains and minerals to species with lifetimes of less than a millisecond. Clearly, if the subject is to be more than a vast catalogue of apparently unrelated facts, we must seek a th... | Quantum Mechanics and Atomic Theory | null |
1979-01-01 | In the foregoing chapters we have frequently used data from physical or spectroscopic methods, and the use of these techniques is central to modern inorganic chemistry. Their development has, however, been somewhat haphazard, often being governed by the availability (and price) of commercial instruments, and often seem... | Physical and Spectroscopic Methods | null |
1979-01-01 | One major new emphasis in single crystal absorption spectroscopy of transition metal systems is the study of low symmetry systems which do not closely approximate octahedral or tetrahedral geometries. Such systems may be characterized by severe distortions of a six coordinate or four coordinate limiting geometry or may... | Applications of Group Theory in the Interpretation of Polarized Absorption and E.S.R. Studies of Transition Metal Systems | null |
1979-01-01 | The spin lattice relaxation rates of Cr°and Mn°in Si depend exponentially on temperature. To explain this the theory of Jahn-Teller interaction of the ground triplet state both with tetragonal and trigonal distortions was developed. Energy levels of both ions are tunnelly splitted. | Spin Lattice Relaxation in the Case of Dynamical Jahn-Teller Effect (Cr° and Mn° in Si) | null |
1979-01-01 | We have referred to the Zeeman effect several times already. This is because it is of prime importance in confirming experimentally many of the vectorial effects in atom mechanics which are the result of quantum-mechanical theory. Together with the Stern-Gerlach experiment the Zeeman experiemnt confirms the existence o... | The Zeeman Effect | null |
1979-01-01 | The energy levels of molecules are labelled, using quantum numbers and irreducible representations, in order to assist in the understanding of the effects of both intramolecular interactions and externally applied perturbations. The irreducible representations of the three-dimensional rotation group K and of the molecu... | The Spin Double Groups of Molecular Symmetry Groups | null |
1979-01-01 | The basic mechanisms of the combined resonance (CR),i.e., electro-dipole excitation of spin transitions, are discussed. In this connection the experimental data on CR in various materials are considered. | Combined Resonance in Semiconductors | null |
1979-01-01 | Recently the nuclear physics community has begun to receive the first dividends on a major investment in the construction of intermediate energy (100 MeV — 1 GeV) accelerators. High precision data from such new accelerators in North America as Bates (MIT), IUCF (Indiana), LAMPF (Los Alamos), and TRIUMF (Vancouver) invo... | Nuclear Studies Involving Intermediate Energy Projectiles | null |
1979-01-01 | The V_k centre + electron recombination luminescence is subject to quenching in the singlet emission band and intensified in the triplet band with applied magnetic field due to the incomplete electron spin polarization. The temporal run of the intensity at T<1 K reflects roughly the ground state F centre spin lattice r... | Luminescence Quenching and Spin Lattice Relaxation in Alkali Halides at Very Low Temperatures | null |
1979-01-01 | The system with two electrons is studied in this chapter. Section XI.1 shows that the space of physical states of the helium atom is the sum of the parahelium and the orthohelium spaces. In Section XI.2 the ionization thresholds (i.e., the energy values E _ n _∞ at which one electron is in the nth level and the other i... | Two-Electron Systems—The Helium Atom | null |
1979-01-01 | During the past several years the discussion of localized electronic states in chalcogenide glasses has been dominated by phenomenological defect models [1–4] in which the nonbonding (lone pair) valence electrons of the group VI elements play a key role. Group VI elements have four p-electrons and three p-orbitals and ... | Localized Electronic States in Glassy Se | null |
1979-01-01 | In our first study of the optical spectrum of sodium the fact that many of the lines were double was ignored for the sake of simplicity. It is well known that the first member of the principal series is the sodium yellow line, which, with quite moderate resolving power, is seen to consist of two lines separated by abou... | Fine Structure and Electron Spin | null |
1979-01-01 | Spectral measurements of the permanent and transient radiation-induced optical absorption in state-of-the-art low loss step and graded index optical fiber waveguides have revealed radiation-induced increases in the OH overtone and combination bands which limit the transmission at long wavelengths. The induced damage in... | Radiation-Induced Optical Absorption Spectra of Fiber Optic Waveguides in the 0.4–1.7 μ Region | null |
1979-01-01 | In these notes we briefly introduce and review the present status of spin polarized electron emission studies from metallic systems. We confine ourselves to the field emission and photoemission technique. We then discuss two examples : 1) field emission from clean 3d metal surfaces and the spin filter effect of EuS on ... | Polarized Electrons from Metallic Systems | null |
1978-12-01 | The optical absorption spectrum of Ni^2+ ion doped in ammonium zinc sulphate has been studied at room and liquid air temperatures. From the nature and the positions of the bands a successful interpretation of all the bands could be made assuming O _ h symmetry for the Ni^2+ ion in the crystal. The fine splitting of the... | Optical absorption spectrum of Ni^2+ doped in ammonium zinc sulphate | null |
1978-08-01 | A new technique, third harmonic de Haas-van Alphen (dHvA) wave shape analysis, is described for measurement of the spin-dependent interactions between conduction electrons and local moments in dilute alloys. We derive expressions for the harmonic content of the dHvA effect in a general case, including simultaneous cont... | Electronic properties from analysis of the harmonic content of the de Haas-van Alphen effect: Application to dilute magnetic alloys | null |
1978-08-01 | Quantum theory predicts that, e.g., in a Stern-Gerlach experiment with electrons the measured spin component $$S_Z = \pm \frac{1}{2}$$ does not come about by an adjustment at the last moment, a forced “flipping” or “tilting” of the spin (vector), which would imply z-angular momentum exchange between particle and instru... | Proof of a retroactive influence | null |
1978-06-01 | For high spin ferric ions in rhombic symmetry, we have used a crystal field model to relate term splittings of the ^4 T _1, ^2 T _2 and ^4 T _2 excited states to zerofield split energies and g values of the ^6 A _1 term. In this model five crystal field parameters were used, namely, one cubic parameter, two tetragonal ... | Crystal field calculation of g values and zero-field splitting for high spin ferric complexes of rhombic character | null |
1978-06-01 | High-spin levels in^208Po, populated in the^208Pb( α ,4 n )-reaction, were studied using α -particles in the energy region 41–51 MeV. The energies of levels above the 6^+ level have an uncertainty of about 10 keV due to the fact that the 8^+→6^+ transition has not been observed so far, but this transition has previousl... | On the yrast two proton-two neutron hole states in^208Po | null |
1978-01-01 | Up until this point, we have been concerned almost exclusively with singlet thermal and photochemical reactions. We now turn our attention to triplet reactions which are different from the corresponding singlet reactions in the following two respects: a) The diabatic surface energetic interrelationships are different, ... | Triplet Reactivity | null |
1978-01-01 | In this chapter, we investigate how relativity manifests itself in highly ionized atoms. We shall study its effects on both atomic structure and transition probabilities since it is through transitions that one studies the structure. Our emphasis will not be on a review of what has been done but rather on providing all... | Relativistic Effects in Highly Ionized Atoms | null |
1978-01-01 | Previous spin-fluctuation theories yielding the strong coupling corrections δ\-β_ i to the five coefficients of the fourth-order invariants in the free energy functional are extended. First, the superfluid part of the susceptibility is calculated up to order δ^4 for all momenta and frequencies and the contribution aris... | Spin-fluctuation theory of strong coupling corrections to the free energy in superfluid ^3He | null |
1978-01-01 | The basic interactions for ion pairs are reviewed and summarized. The most important coupling mechanisms for two electron — two center and for N — electron two-center systems are treated first. In particular, a detailed study of the direct exchange will be used to define and discuss the general form of the exchange ham... | Energy Levels of Strongly Interacting Ion Pairs | null |
1978-01-01 | Angular momentum and isospin are different symmetries and the transformations corresponding to them act in completely different spaces, but from the group theoretic standpoint they are very similar and can be treated using identical methods. This is because the group R (3) of rotations in our three-dimensional space is... | Angular Momentum and Isospin | null |
1978-01-01 | These lectures are intended as an introduction to soliton physics. In Section 1, I indicate in a simple way some of the mathematics underlying our present understanding of soliton theory. In Section 2, I summarize some current applications of this to nonlinear physics. The range of these applications is already vast: I... | Solitons in Physics | null |
1978-01-01 | When a superconductor of low atomic number is placed in a magnetic field H the peaks in the quasiparticle states on each side of the energy gap are Zeeman split by an amount 2μH where μ is the magnetic moment of the electron. In order to see this effect the film must be thinner than about 100 Å and oriented with its pl... | Tunneling With Spin Polarized Electrons | null |
1978-01-01 | Four-body model of the four-nucleon system | null | |
1978-01-01 | Ytterbium diluted in Ag_1-xAu_x has attracted a lot of interest in the last 10 years. As soon as it was known that Yb is in a divalent non magnetic state in Ag^1,3 and in a trivalent magnetic one in Au^2,3 it became clear that for some value of x there should be a configuration cross-over in the Ag_1-xAu_x host, with a... | Thermoelectric Power and Resistivity of Yb Diluted in Ag_1-xAu_x
| null |
1978-01-01 | My talk will have four parts. I will first define the various spin dependent cross sections that can be measured. I will then describe the hardware that is necessary to measure these cross section. Third, I will show some of our recent results on spin effects at large transverse momentum. Finally I will try to say how ... | Spin Forces in Large-P
_⊥
^2
p-p Elastic Scattering | null |
1978-01-01 | The muon: Lonely orphan or missing link | null | |
1977-10-01 | A general theory for the correlation functions of superfluid^ 3 He which takes into account rigorously the magnetic dipole interaction is developed. The resulting equations are solved for the Anderson-Brinkman-Morel (ABM) state and for wave vectors q oriented parallel to the energy gap axis. Then the dispersion relatio... | Effect of dipole interaction on collective modes in^3He-A | null |
1977-09-01 | In the paper the spin-orbit coupling in chelates with conjugated ligands has been studied theoretically. The proposed models were used for the calculation of the lifetime of the ^3Γ_2 electron-transfer triplet state of the complex ion Ru(phen) _3 ^+2 . | Spin-orbit coupling in chelates with conjugated ligands | null |
1977-08-01 | This organometallic compound has a unique crystal structure which allows the formation of isolated, superexchange-coupled spin pairs at low temperatures. Approximately 50% of the Fe^ 3+ spins form these pairs. This pairing is observed in the magnetic susceptibility, heat capacity, and electron spin resonance spectra re... | Electron-spin pairs in iron tetraphenylporphyrin chloride at low and ultralow temperatures | null |
1977-03-01 | A comparison of^51 V n.m.r. data from η^5-CpV(CO)_3PR_3 with e.s.r. data from Fe(NO)_2Br(PR_3) reveals simple correlations between the respective basic resonance parameters depending on the phosphine ligand properties. In particular, the^1J(PV) and A_iso (P) coupling constants exhibit a clear relationship. As can be un... | The relations between nuclear and electron spin resonance parameters of the phosphine complexes η^5-(C_5H_5)V(CO)_3PR_3 and Fe(NO)_2(PR_3)Br | null |
1977-01-01 | The Hall effect seen at low temperatures in dilute alloys of a transition metal dissolved in a group-1B noble metal shows^1,2 a large component that clearly does not arise from the classical Lorentz force. This extraordinary component is found generally to increase with decreasing temperature, to be approximately propo... | Temperature-Dependent Skew Scattering in an AuMn Spin Glass | null |
1977-01-01 | Photoemission plays a special part among electron spectroscopies, in that it combines both optical and electron spectroscopic methods. Stimulation of the sample under observation occurs by absorption of photons, and the electrons emitted as a response are observed. A variety of combinations of variables and observed pa... | Photoemission Spectroscopy | null |
1977-01-01 | As the scope of quantum chemistry broadened from the consideration of stable molecules near equilibrium to encompass potential curves and surfaces, transition states, radicals, ions, and excited states, the shortcomings of the Hartree— Fock (HF) approximation for the description of the electronic structure of molecular... | The Method of Configuration Interaction | null |
1977-01-01 | We report a systematic investigation under pressure of spin susceptibility, nuclear relaxation rate and temperature dependence of the resistivity in the charge transfer salts TTF-TCNQ, TMTTF-TCNQ and HMTSF-TCNQ. The very large pressure dependences observed in the TTF-TCNQ family, which cannot be explained solely by the... | Magnetic properties of one-dimensional charge transfer conductors: Pressure effects | null |
1977-01-01 | Last August, Alan Krisch invited me to the symposium on High Energy Physics with Polarized Beams and Polarized Targets in Argonne National Laboratory to present a paper on my work concerning the structure of elementary particles and its relation to spin. Experiments by Krisch, et. al.,^1 with polarized proton beams sca... | Origin of Spin | null |
1977-01-01 | Chemically induced magnetic polarization (CIMP) refers to various processes whereby free radical reactions in liquids lead to nonequilibrium population of the nuclear spin states of the products and reactants, and similar anomalies in the electron spin state population of the free radical intermediates. The nuclear and... | Radical Pair Mechanism of Chemically Induced Magnetic Polarization | null |
1977-01-01 | Currently theoreticians in molecular science and solid state physics are confronted with a growing demand for a quantitative description of systems consisting of a large, but finite number of electrons. Experiments on systems of increasing complexity are being performed, and very often such additional information is ne... | The SCF-Xα Scattered-Wave Method with Applications to Molecules and Surfaces | null |
1977-01-01 | This paper is devoted to the experimental study of a forbidden magnetic dipole S-S transition, having an oscillator strength as small as 4 × 10^−15. We shall report here on the influence of a dc-electric field and outline the new method which allowed us to measure both the magnitude and the sign of the magnetic dipole ... | Experimental Study of a Highly Forbidden Magnetic Transition, Search for Parity Violation | null |
1977-01-01 | Predissociation is a process in which a molecule in an excited state e can be transferred into a dissociative state of the same energy. Figure 1 shows a typical situation for a diatomic molecule, e is a rovibronic state labeled by its vibrational and rotational quantum numbers v and J. It belongs to an electronic excit... | Laser Spectroscopy and Predissociation of Molecules | null |
1977-01-01 | Splat cooled alloys of composition (La_100−xGd_x)_80Au_20 have been obtained by complete substitution of gadolinium for lanthanum in amorphous La_80Au_20 matrix. Results of high field magnetization (up to 70 kOe), ac and dc low field susceptibility, and resistivity measurements over temperature range of 1.7 to 300°K fo... | From Superconductivity to Ferromagnetism in Amorphous Gd-La-Au Alloys | null |
1977-01-01 | Nuclear spin precessions due to the transient magnetic field in polarized Fe have been measured as a function of the initial velocity of^28Si ions in the first-excited nuclear state. The transient field was found to increase linearly with the ion velocity v in the region v/c =0.006–0.049. This is in contrast to the Lin... | Large transient magnetic fields at high ion velocities in polarized iron | null |
1977-01-01 | Donor-acceptor reactions on chlorophyll and its derivatives are being discussed as model systems for photochemical charge transfer reactions. The CIDNP observed can be explained by the radical pair theory. The polarized triplet esr spectrum of bacterio-chlorophyll in vivo is given as a possible example of the radical p... | Chemically Induced Magnetic Polarization in Systems of Biochemical Interest | null |
1977-01-01 | It is the purpose of this paper to present experimental data which emphasize the narrow band behavior of actinides. We will show that phenomena associated with narrow 5 f -like bands are not rare. The discussion will concentrate on pure actinides and binary cubic intermetallic compounds of the type AnX, AnX_2, and AnX_... | Experimental Studies of Narrow Band Effects in the Actinides | null |
1976-12-01 | ^77Se has been investigated by the reaction^74Ge(α, nγ ) at 14 MeV. Gamma singles spectra, gamma angular distributions and gamma-gamma coincidences have been taken. A level scheme has been established, spins and parities have been assigned. States of a rotational band on the 1/2^− ground state, a rotational band on the... | High spin states in^77Se populated by the^74Ge(α,n γ) reaction | null |
1976-12-01 | Fluor-hydroxyapatites of varying fluoride and hydroxide contents were irradiated by soft x-rays at −188°C and examined by means of electron spin resonance spectroscopy. Variation in fluoride-hydroxide contents affected radical yield and resulted in the observation of two kinds of oxygen anion resonances: a doublet due ... | Radiogenic free radicals in apatite: The influence of fluoride and hydroxide | null |
1976-11-01 | The A ^2 Π _ustate of O_2 ^+ was earlier established as an inverted state contrary to previous assumptions. The rotational analysis of a few more bands of the A-X system of O_2 ^+ has now been completed. These studies show that the spin-orbit coupling constant A in the A ^2 Π _ustate gradually varies with the vibration... | Reinvestigation of the second negative (A
^2
Π
_u−X
^2
Π
_g) band system of O
_2
^+
| null |
1976-09-01 | It is shown how to generalize the semiclassical treatment of dense Fermi gases in the presence of spin-dependent forces. One constructs the Wigner transform of the singlet density matrix in that representation in which the position operator and the z component of the spin operator are diagonal. This way one obtains a m... | A semiclassical description of Fermions with spin-dependent forces | null |
1976-09-01 | Using the^204Hg( α , 3 n ) reaction with α -particles of about 40 MeV, we have proved by applying nowadays conventional γ -ray spectroscopy in-beam technique, that there are two isomeric states in^205Pb at the excitation energies 5,161.3 and 3,195.5 keV having the half-lives 71±3 and 217±5 ns, respectively. These isome... | High spin states in^205Pb and a precision test of the nuclear shell model for three nucleons | null |
1976-01-01 | 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 | null |
1976-01-01 | Pure actinides and metallic actinide systems are very interesting from a theoretical point of view since they show a great variety of experimental magnetic properties. One can observe: Clear magnetism, as in pure curium and berkelium; Kondo effect, as in many transition based alloys with neptunium and plutonium impurit... | Magnetism in Actinides | null |
1976-01-01 | The study of defects in crystals traces its beginnings to the early 19th century and has been intensively pursued for the past 50 years, leading to a tremendously detailed body of knowledge concerning “color centers” in materials with long range order.^1,2 On the other hand, non-crystalline oxides have been actively de... | Defects in Non-Crystalline Oxides | null |
1976-01-01 | The aim of the present lectures is to give a brief general outline of the excited state problem in localized centres either point defects or foreign impurity atoms in ionic crystals, in practice, alkali halides. Attention will be focussed on phenomenology and we will go through the main techniques discussing how the re... | Excited State Properties of Localized Centres | null |
1976-01-01 | Since in these discussions we are mainly concerned by the existence and the properties of electronic collective excitations, a preliminary remark must be made on the interpretation of ESR line-shapes of triplet excitons. This is that the stochastic theories of line-shapes, often utilized by molecular spectroscopists, h... | Electronic Collective Excitations in One-Dimensional Molecular Systems | null |
1976-01-01 | A simple analysis of the critical field of ternary molybdenum chalcogenides with and without magnetic impurities is presented. | On the Upper Critical Field of the Ternary Molybdenum Chalcogenides | null |
1976-01-01 | The electron and the muon are the only charged particles which do not participate in the strong interaction, at present not fully understood nor amenable to rigorous calculation. Therefore measurements on the electron or muon in isolation, and on the μ^+e^− system (muonium) can give information on the fine structure co... | New Measurement of (g-2) of the Muon | null |
1976-01-01 | Even though the field of Coulomb excitation is 1/4 century old, it is only now being exploited to the fullest extent using the heavy-ion beams available from the newest accelerators. The examples I have shown demonstrate that multiple Coulomb excitation is a powerful probe of collective behaviour in low-lying nuclear s... | Nuclear structure inferred from heavy ion coulomb excitation | null |
1975-12-01 | The decays of high spin states in^39K, populated in the reactions^28Si (^16O, αp) and^25Mg (^16O, pn ), have been measured for oxygen beam energies between 30 and 50 MeV. Using the recoil distance Doppler shift method, mean lifetimes were determined for the states at 2814keV ( τ =62±5ps), 3597 (51±4 ps ), 3943 (11.4±1.... | The gamma decay of high spin states of^39K | null |
1975-09-01 | Using α -particles in the energy range 42–51 MeV, the^209Bi( α , 4 n )^209At reaction was studied with the intention of investigating the properties of excited high spin states in^209At. In-beam prompt and delayed gamma-ray and conversion electron spectroscopy reveal two isomeric states at 2429 and 1428 keV having the ... | Evidence for two-particle core polarization in the isomeric 29/2^+ and 21/2^− states of the
$$\pi \left( {h_{{9 \mathord{\left/ {\vphantom {9 2}} \right. \kern-\nulldelimiterspace} 2}}^2 } \right)_{8^ + } i_{1 {3 \mathord{\left/ {\vphantom {3 2}} \r... | null |
1975-03-01 | There is increasing interest in the charge transport properties of crystals which contain identical magnetic nuclei, but with ions of different valence states. A particularly interesting example is a Eu^2+ – Eu^3+ pair, for both ions are insensitive to crystal fields, so there is no electrostatic hindrance to electron ... | Electron transfer from Eu^2+ to Eu^3+
| null |
1975-03-01 | The^72Ge( α, n )^75Se and^73Ge( α , 2 n )^75Se reactions have been studied at bombarding energies of 15 MeV and 22.5 MeV respectively using Ge(Li)-detectors. γ -singles spectra, γ-γ -coincidences, γ -angular distributions and excitation functions have been taken. A level scheme has been constructed, which contains a st... | High spin states in^75Se populated by the^72Ge(α,n) and^73Ge(α, 2n) reaction | null |
1975-03-01 | The polarization of alkali atoms in an alkali vapour produced by optical pumping is transferred to the alkali dimers. The effect of this atom-dimer polarization transfer on the internal variables of the atoms and molecules, such as electron spin and nuclear spin, is investigated theoretically in this paper. | Theoretical studies of the atom-dimer polarization transfer | null |
1975-01-01 | Fractional parentage methods for ionisation of open shells of d and f electrons | null | |
1975-01-01 | The basic principles of electron exchange are covered first and applied to optical transitions in ion pairs. The Frenkel exciton theory of molecular crystals is developed and applied to magnetic crystals. The electronic and magnetic structure of magnetic insulators is reviewed, including aspects of most importance to t... | Spectroscopy of Magnetic Insulators | null |
1975-01-01 | Mössbauer spectroscopy in biology | null | |
1975-01-01 | Various theoretical approaches to the interpretation of recent transfer experiments on light nuclei are outlined. Starting from some simple ideas on the reaction mechanism the observed highly selective nature of the reactions is discussed successively in terms of j-j coupled nucleon configurations, more sophisticated s... | Approaches to the interpretation of heavy ion transfer reactions at high energies | null |
1975-01-01 | The photoemission process is characterized by the initial state, consisting of the unperturbed atom, molecule or solid and photon, and the final state comprising the ionized atom and photoelectron. A major distinction between UV photoemission and X-ray photoemission in solids arises from the properties of the final sta... | Multiplet Splitting in the X-ray Photoemission Spectra of Open-Shell Ions | null |
1975-01-01 | Triplet-intermediates from diazo-compounds (Carbenes) | null | |
1974-12-01 | The spin-orbit coupling constants ζ_ nl and the Slater-Condon parameters F _2 and G _1 are determined from spectral data for several neutral atoms and monopositive ions. | Atomic spin-orbit interaction parameters from spectral data for 19 elements | null |
1974-08-01 | Spin-lattice and spin-spin relaxation times of 1,1-Diphenyl-2-picryl-hydrazyl and its cecrystallized samples have been studied in r.f. region at different temperatures down to liquid air temperature. It is observed that the spin-lattice relaxation time has increased in recrystallized samples but its value with temperat... | Temperature variation of relaxation time in free radical complexes | null |
1974-06-01 | For a molecular model of the Fe-S active site complex in oxidized rubredoxin, we have calculated the spin-orbit coupling between the ground sextet state and excited quartet and doublet states which gives rise to the observed zero field splitting of the sextet ground state into three spin-mixed Kramers doublets. Additio... | Calculated properties of the active site of oxidized rubredoxins | null |
1974-06-01 | A formula for the calculation of the nuclear spin coupling constant | null | |
1974-03-01 | States in^21Ne up to 6.3 MeV have been investigated by means of the^18O(α,nγ)^2Ne reaction. The γ-decay of individual levels was studied in coincidence with neutrons by using a neutron time-of-flight spectrometer. Revised branching ratios are given for the states at 5.34, 5.63, 5.82 and 6.03 MeV. Neutron-gamma angular ... | High spin states in^21Ne | null |
1974-02-01 | Spin assignments have been made to the^25Mg levels in the E _x=5–6 MeV region from γ -ray angular distributions measured in the^22Ne( α, n y ) reaction at E _α=8.0 and 8.8 MeV and from p-γ angular correlations measured in the^24Mg( d, p γ ) reaction at E _d=6 MeV. Unique spin assignments of J =7/2, 5/2, 5/2, and 9/2 co... | New aspects of the rotational model in^25Mg | null |
1974-01-01 | Summary This document is part of Volume 6 ‘Molecular Constants from Microwave, Molecular Beam, and Electron Spin Resonance Spectroscopy’ of Landolt-Börnstein - Group II Molecules and Radicals. | 5.2.1.1 Preliminary remarks | null |
1974-01-01 | Our aim is to interpret the NMR spectra obtained during chemical reactions. We assume that the principles of high-resolution NMR are known to the reader; if not, he may refer to the literature on this subject [ 1 ]. We shall mention only the basic facts necessary to understand the theory. | The Theory of the CIDNP Effect | null |
1974-01-01 | Summary This document is part of Volume 6 ‘Molecular Constants from Microwave, Molecular Beam, and Electron Spin Resonance Spectroscopy’ of Landolt-Börnstein - Group II Molecules and Radicals. | 5.1.5.1 Preliminary remarks | null |
1974-01-01 | It is well known that photolysis of molecules produces radicals which give an electron spin resonance spectrum (ESR). The theory of this effect may be found elsewhere [ 1a, 1d, 1i ]. As for the CIDNP effect in NMR radical chemical reactions may give rise to a similar effect in ESR spectra. The first observation of this... | The Chemically Induced Dynamic Electron Polarization (CIDEP Effect) | null |
1974-01-01 | Summary This document is part of Volume 6 ‘Molecular Constants from Microwave, Molecular Beam, and Electron Spin Resonance Spectroscopy’ of Landolt-Börnstein - Group II Molecules and Radicals. | 5.1.1 Preliminary remarks | null |
1974-01-01 | A simple model taking into account a 6 d and a 5 f virtual bound state with a large d—f hybridization was developed to describe pure actinide metals and has explained the absence of magnetism at the beginning of the actinide series up to americium.^1 We would like to discuss here the behavior of dilute transition-based... | Properties of Dilute Transition-Based Alloys with Actinide Impurities: Evidence of Localized Magnetism for Neptunium and Plutonium | null |
1974-01-01 | Summary This document is part of Volume 6 ‘Molecular Constants from Microwave, Molecular Beam, and Electron Spin Resonance Spectroscopy’ of Landolt-Börnstein - Group II Molecules and Radicals. | 2.9.1.1 Preliminary remarks | null |
1974-01-01 | Summary This document is part of Volume 6 ‘Molecular Constants from Microwave, Molecular Beam, and Electron Spin Resonance Spectroscopy’ of Landolt-Börnstein - Group II Molecules and Radicals. | 5.1.6.1 Preliminary remarks | null |
1974-01-01 | One of the major predictions of BCS theory is that the spin susceptibility in a superconductor should decrease exponentially with temperature, falling to zero at absolute zero.^1 An indirect way of testing this prediction is the Knight shift experiment in which one expects that, like the spin susceptibility, the Knight... | NMR Anomalies and Superconductivity in Transition Metals: Vanadium | null |
1974-01-01 | A “covalency contraction” parameter, R _ v , is defined as the ratio of the until cell volume of a transition metal compound M_mX_n relative to the unit cell volume of Mg_mX_n. This parameter is found to be proportional to the electronegativity of X and thus inversely proportional to the degree of covalence of the M-X ... | Relationships between covalency, interatomic distances, and magnetic properties in halides and chalcogenides | null |
1974-01-01 | Summary This document is part of Volume 6 ‘Molecular Constants from Microwave, Molecular Beam, and Electron Spin Resonance Spectroscopy’ of Landolt-Börnstein - Group II Molecules and Radicals. | 5.2.1.2 Data and references | null |
1974-01-01 | The central problem in the study of hemoglobin is to understand the mechanism of cooperativity, which manifests itself primarily in the sigmoidal saturation characteristic and the Bohr effect. At the outset we recognize that the matter cannot be simple because the iron atoms are separated by distances of 25 to 40 Å, wh... | Approaches to Cooperativity | null |
1974-01-01 | Electron spin resonance linewidths of Nd^3+ in CaWO_4 at 35 GHz and 4.2 K are examined experimentally and theoretically for a range of Nd concentration. The derivative peak-to-peak linewidths, as determined experimentally, increase from 1.1 mT at 0.034% Nd to 4.1 mT at 0.816% Nd in vacancy-compensated single crystals a... | Esr linewidths in neodymium-doped calcium tungstate | null |
1973-09-01 | Transition energies, ionization potentials, dipole moments and oscillator strengths have been calculated for pyridine, pyrazine, pyrimidine, pyridazine, 3-cyanopyridine and 4-cyanopyridine by modified INDO-CI. Triplet radiative lifetimes have been calculated for these molecules. | Calculations of singlet and triplet states of some azabenzenes by modified INDO-CI | null |
1973-08-01 | We construct a thermodynamically consistent approach to a pseudospin many body problem under the observance of spin conservation starting from the RPA of the free energy. For this purpose the Abrikosov method of spin representation is extended to many directly interacting spins. We consider the region of validity of th... | Application of the Abrikosov pseudofermion technique to a homogeneous spin system | null |
1973-08-01 | We have performed electron spin resonance experiments on binary amorphous V_2 O_5- and MoO_3 compounds (V_2O_5-TeO_2, V_2O_5-BaO, V_2O_5-PbO, V_2O_5-GeO_2, V_2O_5-As_2O_3, MoO_3-P_2O_5, MoO_3-TeO_2) and determined the parameters of the corresponding spin Hamiltonian by 3 cm-, 1.2 cm- and 8 mm band measurements. These m... |
d
^1 Electrons in amorphous semiconducting V_2O_5 and MoO_3 compounds. (ESR measurements) | null |
1973-06-01 | The absolute differential cross sections for several levels in the^15N(^3He, n )^17F reaction were measured at laboratory scattering angles from 0 to 140 degrees using neutron time-of-flight techniques. Angular distributions were obtained at effective helion bombarding energies of 3.8 and 4.8 MeV. A new state was ident... | Investigation of states in^17F by the^15N(^3He,n)^17F reaction | null |
1973-01-01 | The production of the state of spin alignment of molecules in the lowest triplet state at low temperatures is discussed. The conditions under which microwave, radiation of resonance frequencies with the zerofield (zf) transitions of these molecules would result in an observed change in the phosphorescence intensity are... | Triplet State Properties from Phosphorescence Microwave Double Resonance Studies | null |
1973-01-01 | In extending the many-electron Hamiltonian to a molecule, nuclei must be introduced. This poses serious problems, since nuclear theory is not in as advanced a state as electron theory; although simple models exist to explain nuclear properties, a serious treatment of the topic is beyond the scope of this book. Fortunat... | The Molecular Hamiltonian | null |
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