Electromagnetic Theory of Gratings
"Electromagnetic Theory of Gratings." Optica Acta: International Journal of Optics, 28(8), p. 1030
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Raman spectra of the rare earth orthophosphates
Abstract Raman spectra of anhydrous crystalline samples of all of the lanthanide orthophosphates (with the exception of PmPO 4 ) have been obtained. These data were interpreted in a systematic manner based on the known structures of these compounds. Assignments and correlations have been made for many of the observed…
Nonstoichiometry in SrTiO3
The defect chemistry of polycrystalline has been studied by means of the equilibrium electrical conductivity as a function of temperature, oxygen activity, Sr/Ti ratio, and impurity additions. Reduction, excess , and acceptor impurities all contribute to the oxygen vacancy content and their effects are therefore highl…
Electrical Transport in Solids
K C Mao and W Hwang 1981 Oxford: Pergamon xvi + 663 pp price £50 This seven-chapter book reviews charge transport, carrier injection, photoelectronic processes and luminescence in semiconductors and insulators. The subtitle reference to organic semiconductors applies to the first chapter on charge transport and the fi…
Spectroscopic properties of molecules interacting with small dielectric particles
Optical properties of small dielectric spheroids with or without adsorbed molecules are studied theoretically. Expressions for the absorption line shapes, the radiative and nonradiative decay rates, and quantum yields are derived. In the case of a molecule near a spheroid the magnitudes differ dramatically from the co…
Thermal Decomposition of Lanthanide, Yttrium, and Scandium Oxalates and Carbonates
Data concerning the thermal decomposition of lanthanide, yttrium, and scandium oxalates and carbonates are surveyed. The complexity of the process, the large number of stages involved, and the dependence of the composition of the intermediates in the thermal transformations on the experimental conditions is noted. Cer…
The influence of the anisotropy on the temperature renormalisation of the magnetic excitations in FeCl2
The authors investigate the temperature renormalisation of the magnetic excitations in FeCl 2 , where, owing to the low value of the spin, a careful treatment of its large anisotropic effects appears to be necessary. A self-consistent renormalised theory which is not affected by kinematic inconsistencies is presented…
Thermally Activated Microwave Conductivity in the Superionic Conductor Hollandite (K1.54Mg0.77Ti7.23O16)
We report the microwave conductivity of a single crystal of the superionic conductor hollandite (${\mathrm{K}}_{1.54}$${\mathrm{Mg}}_{0.77}$${\mathrm{Ti}}_{7.23}$${\mathrm{O}}_{16}$). The charge carriers are potassium ions which propagate along channels. Transport is determined by thermally activated hopping of the po…
Melting transition of small molecular clusters
The melting behaviour for finite size clusters is calculated in the framework of positional disorder theory. It is shown that the 'melting anomalies' observed in a variety of absorbate systems, such as H 2 O in porous Al 2 O and N 2 or Ar on TiO 2 , are consistent with the melting characteristics of small clusters. In…
Photoemission from Ag-O-Cs
X-ray photoelectron spectra of Ag, O, and Cs and quantum yield distributions from surfaces prepared by evaporating Cs onto Ag oxidized in ultrahigh vacuum have been measured. The structure of this surface determined from these measurements consists of silver particles dispersed in a matrix of ${\mathrm{Cs}}_{2}$O with…
The theory of sink strengths
Abstract A formal derivation of the sink strengths to be used in point defect rate theory is presented. Previous models that have been invoked for the approximate evaluation of these parameters are discussed. It is shown that the effective medium approach, as introduced earlier by us, constitutes the best available ap…
Crystal and magnetic structure of the NiMn1−tTitGe system
The magnetic and crystallographic nature of the compounds NiMn1−tTitGe (0 ≦ t ≦ 1) are studied by X-ray and neutron diffraction and magnetometric measurements. It is shown that the solid solutions arise for 0 ≦ t ≦ 1, with the crystal structure of the NiTiSi type. A magnetic phase diagram is constructed: for 0 ≦ t ≦ 0…
Trap spectroscopy by the fractional glow technique
A theory of the fractional glow technique (FGT) for an arbitrary heating regime and first-order recombination kinetics is developed. In order to describe a trap distribution function (TDF) its characteristics: (i) the mean activation energy, (ii) the mean frequency factor, (iii) the recombination intensity, (iv) the F…
Electronic structure ofTl3AsSe3
An experimental and theoretical investigation of the electronic structure of a ternary semiconductor, ${\mathrm{Tl}}_{3}$As${\mathrm{Se}}_{3}$, is reported. The total valence-band density of states has been measured by x-ray photoelectron spectroscopy (XPS). A simple prescription, utilizing atomic term values, is sugg…
Self-consistent-average-phonon equation of state. Formalism and comparison with self-consistent-phonon calculations
The self-consistent-phonon (SCP) formalism has proved valuable in calculating the anharmonic contributions to lattice-dynamic properties. It is a numerical iterative procedure for obtaining the equation of state and other thermodynamic functions. Replacing the sums over frequencies in the SCP formalism by appropriate…
Surface plasmons on a large-amplitude grating
Dispersion relations are obtained by two different methods for surface plasmons (in the nonretarded limit) propagating on the surface of a dielectric medium on which a large-amplitude grating has been ruled. The first method is based on the Rayleigh hypothesis; the second method is based on the extinction-theorem form…
Magnetic Properties of a Ternary Alloy Mn0.5V0.5-yAly
The saturation magnetization per Mn atom P s at 4.2 K was obtained with a relation P s =3.8 y µ B for y c < y <0.35 and P s =2.8 y µ B for y < y c in Mn 0.5 V 0.5- y Al y . Here y c ≈0.2 which corresponds to the concentration at the boundary between B2 and L2 1 (Heusler) structures. The 55 Mn NMR frequency at 4.2 K al…
Infrared spectra of HfS3
The infrared reflectivity and transmission on the quasi-one-dimensional structure Hf${\mathrm{S}}_{3}$ of light with polarizations both parallel and perpendicular to the chains are measured. They are compared with the frequencies already observed in Raman scattering indicating that the interchain coupling is very weak.
Vibrational dynamics of glassy and molten ZnCl2
Polarized Raman spectra of ZnCl2 were obtained in the liquid phase near the melting point (T = 598 K), and in the glassy phase (T = 293 K). Measurements were performed down to a very low frequency shift (2 cm−1) from the exciting line. Our analysis of the Raman data provides an interpretation of the collision-like con…
Optical absorption and emission spectra of Cs2NaHoCl6
Optical absorption and emission spectra are reported for the cubic Cs2NaHoCl6 elpasolite system. Detailed energy and intensity analyses of the high-resolution, variable-temperature spectra allow characterization of the crystal field energy level structure associated with eleven of the Ho3+ term levels. The term levels…