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The author describes how the effect is being employed in several laboratories to obtain information about the momenta of electrons in solids and asserts that the information obtained is fundamental to the understanding of their basic physical and chemical properties.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric properties and relaxation in ethylene carbonate and propylene carbonateRichard Payne and Ignatius E. TheodorouCite this: J. Phys. Chem. 1972, 76, 20, 2892–2900Publication Date (Print):September 1, 1972Publication History Published online1 May 2002Published inissue…
A simple technique is described for the preparation of collagen substrata containing 0 1% of collagen by weight, in the form of native bundles with a 640 A period, the substrata are similar in these respects to soft-tissue matrices These substrate are hydrated collagen lattices (HCLs) in which the watery milieu is hel…
The review was written by JJ.Bikerman specially for Uspekhi Khimii. Bikerman is one of the leading U.S. specialists in the theory and practical aspects of surface phenomena and adhesion in polymers and solids and therefore the presentation of his views on the nature and strength of adhesive joints is of very considera…
The optical fluorescence of ten trivalent lanthanide ions, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Tm in Y2O2S, La2O2S, and Gd2O2S have been measured by X-ray excitation at 300 K. Some lines of Eu3+, Gd3+, and Tb3+ in La2O2S at short wavelengths were found to be quenched at 300 K. La2O2S appeared to be a more efficien…
A systematic investigation, performed on some fifty single crystals, between −40 and 250 °C shows that the values of the bulk resistivity ϱv (20 °C) range from 103 to 1013 Ωcm and that the activation energies lie between 0.1 and 1 eV. These values depend on the conditions of the cooling after oxydation and of high vac…
Infrared and Mössbauer measurements on spinel ferrites of the Ni1–x—yFe+ZnyFe+O4 system have been made. As a result from the analysis, it is supposed that Fe2+ ions are present in both the octahedral and tetrahedral lattice sites of the compounds investigated.
The addition of charge-transfer acceptors to a nematic liquid crystal at concentrations <0.1% has a profound effect on the voltage-transmission characteristics for dynamic scattering, reducing the threshold voltage by a factor of 2 for dc fields, but not appreciably altering the ac behavior. Charge-transfer ban…
The effects of various technological processes on the electronic structure of vanadium-doped TiO2 crystals have been studied. The EPR spectra give clear evidence that by suitable thermal treatment in a reducing atmosphere the tetravalent vanadium ions can be transferred from the substitutional to the interstitial posi…
The energy band structure and optical properties of the zinc-blende semiconductors $3C$-SiC, BP, and BN have been calculated using a nonlocal version of the empirical-pseudopotential method. The results of this investigation are discussed and compared to experiment. The agreement between theory and experiment is found…
A unified study is presented of the infrared behavior of the second-order electric susceptibilities ${\ensuremath{\chi}}^{(2)}$ in semiconducting compounds for both longitudinal and transverse fields. The molecular model used previously for the calculation of ${\ensuremath{\chi}}^{(2)}$ for frequencies above the latti…
The electroreflectance spectra of solution-grown ${\mathrm{Ga}}_{x}{\mathrm{In}}_{1\ensuremath{-}x}\mathrm{P}$ alloys were measured at room temperature in the whole range of composition. The variation of the ${E}_{0}$, ${E}_{1}$, ${E}_{0}^{\ensuremath{'}}$, and ${E}_{2}$ energies with concentration is reported: It is…
New reflectance spectra are obtained for amorphous ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$ and ${\mathrm{As}}_{2}$${\mathrm{Se}}_{3}$. The spectra contain features not reported in earlier studies. Analysis of the spectra in terms of damped Lorentzian oscillators, combined with new Raman data, gives further support to th…
The bend and splay elastic constants of MBBA were measured over its nematic temperature range. The ratio of the two constants is 1.25± 0.05. The temperature dependence of the elastic constants is found to be adequately described by the simple mean-field models. A comparison is made between viscosity coefficients obtai…
The phosphorescence from benzophenone crystals has been investigated as a function of temperature between 7 and 77°K. Three types of T → S emission are detected and the importance of vitreous defects in crystalline benzophenone is examined.
The photoelectron spectra of vinyl bromide, cis- and trans-1,2-dibromoethylene and 2-bromopropene have been obtained. Interaction of the bromine "lone pair" electrons with those in the C=C π bond is discussed. The assignments are considered in relation to the chloroethylenes. The spectra provide experimental evidence…
It is assumed that the one-electron density function for a molecular crystal can be determined from x-ray diffraction data with the use of generalized x-ray scattering factors. The relationship between several physical properties and electron population parameters are given. These include molecular dipole moments and…
Energy bands of SrTi${\mathrm{O}}_{3}$ have been computed ab initio using a nonrelativistic self-consistent-field (SCF) procedure based upon the linear-combination-of-atomic-orbitals or tight-binding formalism. A slightly extended multicentered-atomic-orbital basis was used and integrals over them were evaluated in ke…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Ikram Morcos; Surface Tension of Stress‐Annealed Pyrolytic Graphite. J. Chem. Phys. 15 August 197…
The Raman spectra of the $2H$ and $4H$ structures of ZnS have been measured between room temperature and 60 K, and compared with the spectra from zinc blende ZnS. The observed phonons in each case are in good agreement with those expected from the known structural differences.