publicationDate stringlengths 10 10 | abstract stringlengths 0 37.3k | title stringlengths 1 5.74k | doi stringlengths 11 47 ⌀ |
|---|---|---|---|
1973-01-01 | Mössbauer results for gold iron and copper iron alloys at 300 K and 4.2 K are analyzed to show that the spins in such alloys point in directions determined by the local environment. For clusters of three or more iron atoms linked as near neighbours, the spins point in directions consistent with a large pseudodipolar an... | Spin Arrangements in Dilute Alloys | null |
1973-01-01 | The main physiological function of hemoglobin is to pick up molecular oxygen in the lungs, transport it to the tissues and deposit it there. On the face of it, this is not especially remarkable; it is only when the process is examined in some detail that a number of unusual features emerge. | Structural Characteristics and Electronic States of Hemoglobin | null |
1973-01-01 | The garnet of composition Bi_3−2xCa_2xFe_5−xV_xO_12 (BiCaVIG) is derived from the well known yttrium iron garnet (YIG) wherein Y^3+ ions are completely replaced by a combination of Ca^2+ and Bi^3+ ions and Fe^3+ ions are partly substituted with V^5+ ions ^(1, 2).Though BiCaVIG is isostructural to YIG one can expect a c... | Cation Disorder and Magnetic Properties of Certain Garnet Type Crystals | null |
1973-01-01 | Several physical phenomena are studied using measurements of the degree of circular polarization of recombination radiation in semiconductors during excitation by circularly polarized photons with energies corresponding to interband transitions. The effects of an external magnetic field are investigated. Experimental r... | Polarized Luminescence of Semiconductors Due to Optical Orientation of Electrons | null |
1973-01-01 | The production of spin polarized particles by collisions between initially unpolarized particles has been of continuing interest since the early theoretical work of Mott^1 on elastic electron scattering. In the subsequent forty years various experiments have been devised to polarize elementary particles, particularly e... | Spin Polarization in Proton-Xenon Charge Exchange Collisions | null |
1973-01-01 | A survey of working methods for producing polarized electron beams is presented. The utility of these sources is compared. | Polarized Electron Sources | null |
1973-01-01 | It has been well known for many years that electromagnetic wave propagation in magnetized media can lead to nonreciprocal effects. The classical case is that of the optical Faraday effect in which the plane of polarization rotates clockwise or counterclockwise, with respect to the propagation direction, according to wh... | Microwave Ferrites and Applications | null |
1973-01-01 | The numerous applications in various fields of chemistry and physics have clearly demonstrated the potential of X-ray photoelectron spectroscopy. A number of interesting experimental projects will be completed in the near future and papers with new and more reliable reference data will appear in the literature. Further... | X-ray photoelectron spectroscopy | null |
1973-01-01 | It has been suggested by several authors that in Fe_3O_4 and the vanadium bronzes (e.g. Na_ x V_2O_5) the current carriers are small or intermediate polarons, heavy enough to “crystallize” at low temperatures. This hypothesis is examined in detail, the interaction between polarons and the effect of a high concentration... | Some Problems about Polarons in Transition Metal Compounds | null |
1973-01-01 | The system M^1 - NH_3 (M^1 = metallic dichalcogenide) has been studied. Based on the theory of electron donor-acceptor complexes it is assumed that the intermolecular forces between the crystalline layer material and small intercalate molecules are due to dispersion (or van der Waals type interactions) and to charge tr... | On Superconducting Metal-Ammonia Complexes | null |
1972-11-01 | Calculation of the spin hamiltonian parameters for hexacoordinate transition metal ions with trigonal prismatic coordination | null | |
1972-01-01 | On the general theory of magnetic susceptibilities of polynuclear transition-metal compounds | null | |
1972-01-01 | It was suggested by Feshbach ^1) that the optical model potential might contain a spin-spin term of the form I.σ (where I and σ are respectively the target and projectile spin operators) which would give rise to different scattering for the various possible channel spins. One manifestation of this potential would be a ... | S- and P-Wave Strength Functions and the Spin, Isospin and Spin-Orbit Dependence of the Optical Potential | null |
1972-01-01 | In this chapter, as in the previous one, there will be a great deal of emphasis on color centers in alkali halides and especially on the F center.* It is surely the best understood and most widely investigated center in ionic crystals. Since it consists of an electron localized at a halide ion vacancy, it is a very sim... | Properties of Electron Centers | null |
1972-01-01 | Notes on the Solutions and Results | null | |
1972-01-01 | The chemistry of complexes related to cis-Pt(NH_3)_2Cl_2. An anti-tumour drug | null | |
1971-08-01 | The dynamic spin polarization of conduction electrons by an impurity spin is shown to provide a significant positive contribution to the impurity hyperfine field, accounting for the fact that the hyperfine field per unit impurity spin is only about half as large for impurities in metals as in insulators. The anomalousl... | Hyperfine fields in 3d impurities in metals | null |
1971-01-01 | The gaseous monoxides of the transition metals present interesting problems in a number of related fields. The group contains some of the most stable diatomic molecules known, so that they are often of importance at high temperatures, and it is indeed through mass-spectrometric studies of high temperature equilibria th... | Spectroscopic Properties of the Diatomic Oxides of the Transition Elements | null |
1971-01-01 | There are a number of review papers discussing the different aspects of the Mössbauer effect in connection with chemical concepts [1–4]. In the present chapter we shall take the point of view of a coordination chemist who asks to what extent the Mössbauer effect can be of any help in the specific problems of his field. | Application to Coordination Chemistry | null |
1971-01-01 | σ and π Electrons in theoretical organic chemistry | null | |
1971-01-01 | The economic significance of iron has resulted in great interest over the years in the products of its oxidation, and more recently in the vast ranges of ternary oxides such as spinel ferrites which have been commercially exploited in their own right. | Iron Oxides and Sulphides | null |
1971-01-01 | The present thesis originates from the interest in the Laboratory for Organic Chemistry of the University of Amsterdam in the chemistry of nitroso compounds. The results of the investigations in this field have been published in the series “ C -Nitroso Compounds, ” starting in 1966.^1 | Introduction and Survey of Literature | null |
1971-01-01 | In Chapters 6 and 7 the data for both high-spin and low-spin iron(II) and iron(III) complexes were discussed. Although these are the common electronic configurations for these oxidation states, there is also a minority group of compounds which show either ligand field crossover from high-spin to low-spin configuration ... | Unusual Electronic Configurations of Iron | null |
1970-10-01 | Пересматривается проблема аномального триплетного расщепления в α и γ системах полос TiO, так как в последнее время стало известным, что переходами, ответственными за эти системы, являются переходы C ^3 Δ− X ^3Δ и A ^3Φ− X ^3Δ соответственно, а не C ^3Π− X ^3Π и A ^3Δ− X ^3Π, как это предполагалось раньше. Как уже Кова... | Re-investigation of the coupling constants of the revised molecular states of TiO | null |
1970-10-01 | Measurements are reported of the Raman effect on single crystal ferromagnetic CdCr_2Se_4 and CdCr_2S_4 as a function of temperature. The lines observed at 158 cm^−1, 172 cm^−1 and 241 cm^−1 for CdCr_2Se_4 and 257 cm^−1, 281 cm^−1 and 396 cm^−1 for CdCr_2S_4 have been identified as due to Г _12 ^+ , Г _25 ^+ and Г _1 ^+... | Phonons and magnetic order in ferromagnetic CdCr_2Se_4 and CdCr_2S_4
| null |
1970-09-01 | Опредедляется двух-частичный эффективный оптический потенциал через функции перекрытия, используя дисперсионные соотношения для фазовых сдвигов. Предложенная модель основывается на предыдущих вычислениях авторов диффракционных эффектов с помощью унитарной S -матрицы. Предлагается новый метод учета спина в многокрчном р... | Spin structure of multiple scattering | null |
1970-06-01 | In the framework of a previously discussed translationally invariant particle hole model the T =1 part of the differential electrodisintegration cross section of^4He is calculated. A comparison with a recent measurement of this reaction gives fairly quantitative agreement, but it is suggested that in the region below 2... | Calculation of the electrodisintegration cross section of^4He | null |
1970-04-01 | Une analyse du spectre de résonance de spin électronique de quartz fumé montre que le centre paramagnétique est formé par un défaut d’électron, piégé par l’un des quatres ligands d’oxygène autour d’un ion substitutionnel d’aluminium. L’ion métallique ayant la symmétrie C_2 dans l’ α -SiO_2, deux des sites de l’oxygène ... | The electronic structure of the trapped-hole center in smoky quartz | null |
1970-01-01 | The discovery and use of the neutron-diffraction method of studying magnetics possessing an ordered atomic magnetic structure produced many surprises. The real world of magnetic structures proved to be richer and more variegated than the fictitious world hitherto created by theoreticians. The concept of magnetic struct... | Modern Views on Atomic Magnetic Ordering | null |
1970-01-01 | Recently, a magnetic hyperfine structure in muonic ^203Tl and ^205Tl has been measured by direct observation of nuclear γ-ras: During its cascade to the 1s orbit the muon excites the nuclear 3/2^+ state at 279 keV and at 204 keV in ^203T1 and ^205Tl respectively, which then decays while the muon is still present in its... | Magnetic Hyperfine Structure in Muonic Thallium | null |
1970-01-01 | The current situation with respect to theory as compared to experiment for the Knight-shifts and relaxation times in alkali metals is reviewed. The roles of the direct spin-density at the nucleus from the conduction electrons, of the exchange core-polarization effect, of the relativistic corrections to the spin-density... | Hyperfine Interactions and Associated Properties of Alkali Metals | null |
1970-01-01 | It is now six years that quarks were first proposed [1] and with the exception of five cloud chamber tracks reported by a Sydney group [2] which have been disputed a lot [3] and one bubble chamber picture [37] there is no experimental evidence for their existence. The trouble is that we know very little about physical ... | Some Remarks on the Quark Model | null |
1970-01-01 | The spectra of ferric haems and haemoproteins | null | |
1970-01-01 | Nuclear magnetic resonance (NMR) of an isotope occurs at a fixed frequency for a fixed externally applied magnetic field. To be exact, the angular frequency ω is equal to the product of gyromagnetic ratio γ and the magnetic field H_O. γ is simply the ratio of the magnetic moment of the isotope to the spin of the same. ... | Nuclear Magnetic Resonance in Superconductors and Dilute Alloys | null |
1970-01-01 | Berkowitz^(1) and Berkowitz and Schein^(2) first drew attention to the abnormal properties of a hard black lignite from the Sharigh region of Pakistan. These properties included a low heat of wetting of about 5 cal/gm in methanol, a low inherent moisture content of 1.7%, and caking properties corresponding to a free sw... | Some Spectral Observations on Coking Lignites | null |
1969-10-01 | Directional-correlation measurements for the transition 6.849 MeV → 0.7767 MeV → 0.0 MeV, involving the gamma-ray cascade 6.072 MeV → 0.7767 MeV from the^89Y(n, γ)^90Y reaction were carried out employing thermal neutrons from the CIRUS reactor. The final value of the A _22 coefficient after applying various corrections... | Gamma-gamma angular correlation measurements from^89Y(n, γ)^90Y | null |
1969-07-01 | Electron Spin Resonance of CaWO_4 with 0·1% of Cr has been investigated at liquid nitrogen and liquid helium temperatures. The observed ESR spectrum is attributed to Cr^5+ ion in the substitutional site of W which has a compressed tetrahedral surroundings. A simple point charge calculation based on this geometry explai... | Electron spin resonance of Cr^5+ in CaWO_4
| null |
1969-06-01 | It is shown that a previously described method for measuring the spin resonance of free electrons in a trap can also be used to measure their ( g -2) anomaly. The electrons are trapped in an electrostatic quadrupole field with a superimposed homogeneous axial magnetic field, and are polarized by spin exchange. The spin... | Method for measuring the anomalous magnetic moment of free electrons | null |
1969-03-01 | Linear Regge trajectories, secondary trajectories, form factors and their relation to high-energy hadron scattering are consequences of the O(4, 2) model of strong interactions. The O(4), O(2, 1) and the two distinct SL(2, C) classifications of trajectories used at present, as well as the exchange degenerate trajectori... | Implications of the O(4.2) model of strong interactions for regge pole and high-energy phenomenology | null |
1969-01-01 | Electron spin resonance (ESR) absorption spectroscopy is that branch of radio-frequency spectroscopy which deals with the lowest-lying terms of systems having some degree of electronic angular momentum. This momentum may originate from the intrinsic spin, orbital motion, or both, of electrons. In either case, terms pos... | Introductory Notes to Electron Spin Resonance Absorption Spectroscopy | null |
1969-01-01 | The title of this chapter is “Excitons.” However, within the limitation of a single chapter, it will be impossible to give a detailed account of this broad subject, even making use of Dr. Reynolds’ chapter dealing with the important II–VI compounds (Chapter 10). Therefore, this chapter will present selected topics with... | Excitons | null |
1969-01-01 | Valence-shell expansion studied by radio-frequency spectroscopy | null | |
1969-01-01 | The first paper on this subject was by Waller^1 in 1932. His calculations, appearing before any of the relaxation measurements of Gorter^2 and his co-workers, involved both spin-spin and spinlattice interactions in paramagnetic salts. Waller considered that the mechanism by which the spin system relaxed to the lattice ... | Theoretical Description of Spin-Lattice Relaxation | null |
1969-01-01 | Recent interest[1] in two spin wave optical processes in rutile and cubic antiferromagnets has given rise to several proposals[2] for the origin of the coupling between the light and the spin waves. The question of which mechanism is likely to dominate in a given material does not seem easy to settle quantitatively on ... | Some Possible Experiments for Study of Mechanisms of Two Spin-Wave Scattering and Absorption | null |
1969-01-01 | When light passes through matter weak random scattered radiation appears. In the early 16th Century, Leonardo da Vinci prophetically suggested scattering by particles of air as the explanation for the blueness of the sky. This idea was pursued by many scientists including Newton and Tyndall who tried with only limited ... | Light Scattering with Laser Sources | null |
1969-01-01 | Localized magnons have already been identified employing various experimental techniques as fluorescence[1] or neutron scattering studies[2]. However, their observation by Raman scattering or far infra-red absorption has not yet been reported. We present below experimental results showing evidence of both processes in ... | Observation of Localized Magnons by Raman Scattering and Far Infra-Red Absorption in Ni Doped MnF_2
| null |
1969-01-01 | A semiempirical valence-bond treatment including polar structures has been developed. Explicit formulas are given for the calculation of energy matrix elements and of charge and spin densities. The method has been applied to benzyl and allyl radicals and to butadiene. Es wurde ein semiempirisches Valence-Bond-Verfahren... | Valence bond treatment of systems involving orbital degeneracy | null |
1968-01-01 | Nous avons utilisé les fonctions d'onde engendrées à partir d'un modéle de champ cristallin fort pour les complexes de l'ion ferrique à symétrie tétragonale avec couplage spin-orbite, pour calculer le comportement de quelques propriétés localisées de l'ion ferrique dans des zones de paramétres correspondant à différent... | Spin-mixing and the different spin states of ferric ion in tetragonal symmetry | null |
1968-01-01 | The stability of^6Li_Λ
| null | |
1967-06-01 | Подробно исследуется модель аннигиляции протона и антипротона через усовершенствованную модель кварков, предложенную Рубинштейном и Штерном. Эта модель предсказывает, что все конечные состояния являются трехмезонными состояниями, образованными из системы π, ν, X, ρ, ω, и делает возможным вычисление их относительных ско... | A study of the quark rearrangement model of nucleo-antinucleon annihilation | null |
1967-01-01 | The physics of hemoglobin | null | |
1966-11-01 | Properties of some excited states of^174Yb | null | |
1966-09-01 | A systematic study of the problem of further classification of higher boson resonances is conducted by deriving an approximated mass formula for the group U _6⊗ U _6⊗ O _3 l for any given l . Si esegue uno studio sistematico del problema dell'ulteriore classificazione delle risonanze bosoniche superiori deducendo una f... |
l-excitation inU
_6⊗U
_6
| null |
1966-05-01 | Sono stati calcolati per il gruppo degli isotoni^51Ti,^52V,^53Cr,^54Mn e^55Fe i livelli energetici originati dall’accoppiamento del singolo neutrone nello strato 2 p _3/2 con i protoni nello strato 1 f _7/2. L’effettiva residua interazione protone-protone e neutrone-protone è stata dedotta dagli spettri sperimentali de... | Nuclear spectroscopy of theN=29 isotones | null |
1966-04-01 | Per gli hadroni si propongono modelli a strati, basati su simmetrie superiori. Si studia la struttura dei supermultipletti e si ottengono formule delle masse per le configurazioni inferiori negli schemi jj e LS . Shell models of hadrons are proposed, based on higher symmetries. The supermultiplet structure is investiga... | Shell model of hadrons based on higher symmetries | null |
1966-02-01 | Rotational levels of odd-odd light deformed nuclei | null | |
1966-01-01 | Les fonctions propres et les énergies du complexe Ferrihémoglobine «low spin» sont calculées pour un fort champ de ligandes à symétrie cubique, en tenant compte des distortions tétragonale ( R ) et rhomboédrique ( u ), ainsi que du couplage spin-orbite ( δ ). Avec les parametres R=1000 cm^−1, u=2000 cm^−1, δ=420 cm^−1,... | Low spin ferric hemoglobin complexes | null |
1966-01-01 | To gain information from an E.S.R. spectrum, the factors affecting its formation must be understood. They manifest themselves as fluctuations of absorption against magnetic field, whether they be observed by the movement of an electron beam or of a recorder pen. We shall now consider what these fluctuations mean. | The Interpretation of Electron Spin Resonance Spectra | null |
1966-01-01 | The term ‘semiconductor’ is used to describe a large number of materials whose electrical conductivities lie between those of insulators (~10^−10 mho/cm or less) and metals (~10^5 mho/cm). | Energy Bands and Impurity States in Semiconductors | null |
1966-01-01 | Before discussing the many and varied applications of E.S.R., it may be just as well to mention the very first application of this technique by Zavoiskii^1 in 1945, as this gives the underlying principle used, namely the study of energy level separations between the Zeeman levels in paramagnetic materials. | Applications of Electron Spin Resonance | null |
1966-01-01 | Hemoglobin and its prosthetic group, heme, have been the objects of a number of recent Mössbauer spectrometry studies [1, 2, 3, 4, 5]. In addition to being of considerable biological interest, hemoglobin is also a convenient host material for the study of dilute systems of paramagnetic iron ions. The hemoglobin molecul... | Mössbauer Spectrometry of Hemoglobin: Paramagnetic Effects | null |
1966-01-01 | Earth orbiting satellites usually require some means of determining their attitude with respect to the earth, either for control or monitoring purposes. Infrared sensors which detect the sharp thermal discontinuity at the earth-space horizon have been developed for this purpose and are being used in a number of America... | Infrared Horizon Sensors for Attitude Determination | null |
1965-01-01 | Die Spin-Bahn-Aufspaltung des X ^2 Π -Zustandes von NO wurde mit verschiedenen Potentialen unter Verwendung der SCF LCAO MOs von Brion, Moser und Yamazaki berechnet. Der experimentelle Wert für W (^2 Π _3/2) − W (^2 Π _1/2) beträgt 122 cm^−1. Die Rechnung mittels eines reinen Kernfeldes liefert den Wert 328 cm^−1 und u... | A calculation of the spin-orbit splitting of the X
^2Π state of NO | null |
1965-01-01 | Recently Kondo explained the resistance minimum in dilute alloys by the s-d scattering model. He showed that the second-order Born approximation to the scattering cross section contains a log T term which gives a good fit to the observed resistance at low temperatures. This term arises as a consequence of the dynamical... | Anomalous Electron Scattering in Dilute Magnetic Alloys | null |
1964-01-01 | It has been discussed by various authors how the observed absorption bands of octahedral complexes can be represented analytically as approximately gaussian error curves. Some authors have preferred the wavelength as the independent variable (1), others the wavenumber in which case the half width of the curves sometime... | Observability of Splittings of Excited Energy Levels Caused by Spin-Orbit Coupling or Low Symmetry Components of the Core Field | null |
1964-01-01 | A simple model is proposed for the spin-dependent infrared absorption band observed in antiferromagnetic NiO crystals. The transition is attributed to the coupled action of the radiation field with the lattice vibrations. The variation of the exchange parameter due to the electric field and the displacement of the ions... | Vibrationally induced electronic transitions in crystals of magnetic compounds | null |
1962-01-01 | Nuclear magnetic resonance absorptions have been observed in zero applied field in the insulating ferromagnet CrBr_3. Three lines are shown to be a quadrupole split triplet from nuclei in the bulk of the domains. A fourth, with a resonance frequency of 56.58 Mc at 1.34°K and a 250-kc linewidth, is ascribed to nuclei in... | NMR in Domains and Walls in Ferromagnetic CrBr_3
| null |
1962-01-01 | Recent development in the theory of screw structure of spins and its modification due to anisotropy energy and applied magnetic field is reviewed, with reference to neutron diffraction work on rare-earth metals and MnAu_2. | Modification of Spin Screw Structure due to Anisotropy Energy and Applied Magnetic Field | null |
1961-06-01 | The free radicals obtained from tetraphenylhydrazine, diphenylbenzidine and diphenylamine under different conditions have been investigated with electron spin resonance techniques. The identification and differentiation between the radicals were done on the basis of their g -values and the line-widths and hyperfine str... | Electron spin resonance studies of the free radicals derived from tetraphenylhydrazine | null |
1959-01-01 | The polarization of nucleons scattered by nuclei yields useful information regarding the compound state of the nucleon-nucleus system. In particular it has been shown by Critchfield and Dodder [ 1 ] in the case of p- He^4 scattering that the resonance observed in the region 3 to 10 Mev is connected with a nucleon-nucle... | Polarization of Nucleons Scattered by Nuclei | null |
1958-01-01 | We turn now to an analysis of the magnetic moments of nuclei, starting with light nuclei. We shall see that the measured values of the magnetic moments are in agreement with shell theory up to nuclei consisting of more than 20 particles. | Structure of the Nucleus (Light Nuclei) | null |
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