Materials Literature
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The spectral dependence of the infrared absorption cross section of As in Si near 0 K has been determined from infrared transmission measurements for three As concentrations (5.3, 8.4, and 15.9 x 10(17) cm(-3)) in the impurity band regime. The results demonstrate some features of physical interest. With increasing As…
A screened Rutherford cross section is modified by means of a correction factor to obtain the proper transport cross section computed by partial-wave analysis. The correction factor is tabulated for electron energies in the range 0–100 keV and for elements in the range from Z=4 to 82. The modified screened Rutherford…
We have performed photoelectron spectroscopy of the clean GaP(110) surface, obtained by cleaving n-type specimens. The results show that Fermi-level stabilization occurs in a wide range of positions. In some cases nearly flat bands were obtained. The surface Fermi-level position in n-type GaP(110) is then due to extri…
Ultraviolet photoemission spectroscopy, Auger-electron spectroscopy, and low-energy electron diffraction have been used to study the electronic structure of CoO(100) surfaces obtained by cleaving single crystals in ultrahigh vacuum. Two distinct types of surface defect states that can be produced by ${\mathrm{Ar}}^{+}…
Alkali-metal superoxides have been prepared in situ and studied by ultraviolet photoemission with use of synchrotron radiation. A consistent spectral assignment of the valence-band emission features has been achieved for the first time. The photoemission process corresponds to a transition from ${\mathrm{O}}_{2}^{\mat…
Dielectric properties of hexagonal BaTiO 3 have been studied under a variety of conditions. Anomalies are found in the dielectric constant ε ' c along the hexagonal c -axis: a cusp-like anomaly at T 0 =222 K and a peak at the ferroelectric Curie point of T c =74 K. After a dc field cooling treatment applied along the…
With quasielastic neutron scattering the elementary diffusion jump (length and direction) and the jump frequency in bcc \ensuremath{\beta}-Ti single crystals have been determined at temperatures between 1460 and 1580 \ifmmode^\circ\else\textdegree\fi{}C. Supplementary measurements on polycrystalline samples extended t…
For the electronic optical hyperpolarizabilities for molecules γω∥=γZZZZ(−ωσ;ω1, ω2,ω3) and γω⊥=γZXXZ(−ωσ;ω1, ω2,ω3), where Z and X are laboratory axes and ωσ=ω1+ω2+ω3, it is demonstrated that the following relationships exist: (1) γω∥/γ0∥ =1+Aω2L+⋅⋅⋅ , where ω2L=ω2σ+ ω21+ω22+ω23 and A is frequency independent; (2) γω…
The one-dimensional extended Peierls-Hubbard model with half-filled-band electrons is studied in order to clarify the lattice relaxation path of the photogenerated charge-transfer excitation in halogen-bridged mixed-valence metal complexes. The ground and excited states are calculated within mean-field theory for elec…
Optical excitation energies ascribed to the ${\mathrm{Mn}}^{2+}$ center in ZnS:Mn are calculated from Gaussian-based self-consistent-field (SCF) molecular orbitals (MO's) obtained for the tetrahedral ${\mathrm{MnS}}_{4}^{6\mathrm{\ensuremath{-}}}$ cluster at three Mn-S distances in a static external potential, followe…
Films of amorphous ${\mathrm{GeSe}}_{2}$, ${\mathrm{GeSe}}_{3}$, and ${\mathrm{GeS}}_{2}$ have been deposited at various angles of incidence onto appropriate substrates and the nature of the photoinduced oxidation (as monitored by the Ge-O peak at \ensuremath{\sim}800 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ in the…
The dependence of electronic conductivity upon the length (L) of conjugated segments is calculated for conducting polymers for which (1) interruptions in conjugation on neighboring chains are uncorrelated, (2) all chains are equivalent, and (3) intersegment hopping controls chain-direction conductivity. If interchain…
In this article we compare the experimental O 1s x-ray-absorption (XAS) spectrum of CuO with the results of an augmented-localized-spherical-wave (ALSW) calculation with an extended basis set. By extending the basis set in the calculation, we obtain a good overall agreement between experiment and the O 2p unoccupied d…
Electron-spin-resonance studies have been made of the kinetics of \ensuremath{\gamma}-ray-induced defect creation in samples of undensified, low-OH-concentration (<5 ppm) and high-OH-concentration (>1200 ppm) silica and in samples plastically densified by 12.3% (low OH) and 13.8% (high OH). For the oxygen-vacanc…
The temperature and frequency dependence of electrical conductivity (${\ensuremath{\sigma}}_{\mathrm{dc}}$) and the electrical modulus of sodium, rubidium, and Na-Rb mixed alkali germanate and aluminogermanate glasses have been determined for varying alkali concentrations, and [Al]/[Ge] and [Na]/[Rb] ratios. In a few…
Magnetic susceptibility measurements conducted by the superconducting quantum-interference device (SQUID) technique in the temperature range 6--300 K on electrochemically synthesized polypyrrole and polythiophene doped with tetrafluoroborate (${\mathrm{BF}}_{4}^{\mathrm{\ensuremath{-}}}$) are reported. The temperature…
By performing the local-density-functional band calculations, we analyzed the phase stability of nine binary-alloy systems which are composed of Ni, Pd, or Pt as one element and Cu, Ag, or Au as the other. Most of the qualitative aspects of the phase diagrams of these systems are reproduced successfully. It is pointed…
With use of the molecular-dynamics technique, the structural and dynamical correlations in molten and vitreous ${\mathrm{GeSe}}_{2}$ are investigated with an effective interionic potential which consists of Coulomb, charge-dipole, and steric interactions. It is found that the short-range order is dominated by Ge(${\ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman spectroscopyRobin L. GarrellCite this: Anal. Chem. 1989, 61, 6, 401A–411APublication Date (Print):March 15, 1989Publication History Published online22 September 2008Published inissue 15 March 1989https://pubs.acs.org/doi/10.1021/ac00181a001https://doi.…
The relationship between geometry and physical properties of aperiodic structures is investigated by considering the example of the tight-binding Schr\"odinger equation in one dimension, where the site potentials are given by an arbitrary deterministic aperiodic sequence. In a perturbative analysis of the integrated d…