Materials Literature
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We propose a method for determination of the complex refractive index of absorbing materials either in bulk or film geometry by measuring its reflectivity when coated with a well-characterized transparent dielectric at two specific optical thicknesses: n(1)d(1) = lambda(0)/4 and n(1)d(1) = lambda(0)/2. The complex ref…
We report a self-consistent calculation of the optical nonlinear response of the electrons of a small metal spherical particle. We use the jellium model to describe the metal sphere and work within the random-phase approximation. This calculation allows us to obtain general expressions of the linear polarizability and…
We present an x-ray diffraction study of the charge-density wave (CDW) in a blue-bronze single crystal doped with vanadium atoms. We show that the 2${k}_{f}$ (${k}_{f}$ is the Fermi wave vector) component of the distortion wave vector, which is about 0.75 at low temperatures in the standard blue bronze ${\mathrm{K}}_{…
Calculations of the atomic and electronic structure of ${\mathrm{Ca}}_{\mathrm{x}}$${\mathrm{Al}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$ glasses (with x=0.70, 0.60, 0.50, and 0.33) and of the crystalline intermetallic compound ${\mathrm{CaAl}}_{2}$ are presented. For the amorphous alloys the calculations are based on r…
We report an electrolyte-electroreflectance (EER) study of a ${\mathrm{RuS}}_{2}$ single crystal in the energy range 1.9--5.1 eV. The EER spectrum exhibits sharp structure in the vicinity of interband transitions. Transition energies are determined accurately. Photocurrent versus wavelength measurements show an indire…
The major secretory ribonuclease (RNase) of human urine (RNase HUA) was isolated and sequenced by automatic Edman degradation and analysis of peptides and glycopeptides. The isolated enzyme was shown to be free of other urine RNase activities by SDS/polyacrylamide-gel electrophoresis and activity staining. It is a gly…
A systematic study of specific-heat and transport properties of the icosahedral (I) and Frank-Kasper (FK) phases of Al-Cu-Li and Al-Cu-Mg alloys was performed. The intrinsic resistivities of some samples were reproducibly derived with use of a method independent of sample microstructure and geometry, based only on sup…
The room-temperature adsorption of Cs on n-type GaAs(110) has been studied with use of core-level photoelectron spectroscopy. The coverage-dependent splitting of the Cs 4d core level into two sets of doublets indicate site-dependent adsorption for submonolayer coverages up to about 0.5 monolayer (ML). The broadening o…
C 13 H 21 Br 3 O 2 cristallise dans P2 1 2 1 2 1 avec affinement jusqu'a 0,028. Le cycle a 6 chainons a une conformation chaise. L'autre cycle a une conformee bateau-chaise-bateau deformee
The transverse magnetoresistance of the organic series (DMtTSF${)}_{2}$X (with X=${\mathrm{AsF}}_{6}$, ${\mathrm{PF}}_{6}$, ${\mathrm{BF}}_{4}$, ${\mathrm{ClO}}_{4}$, and ${\mathrm{ReO}}_{4}$) has been investigated in a wide range of temperature and magnetic field, down to 2 K and up to 40 T. The angular dependence of…
A calculation of photoelectron emission from small particles in the photon energy range from threshold to 11 eV is presented. The calculation is based on a three-step model accounting for the spherical geometry. It explains the anomalous shape of the yield curve observed in previous experiments on 5-nm Ag particles. T…
A calculation of the large-angle x-ray-scattering spectra is derived for crystalline multilayered films having extended interfaces with linear random alloy-composition variation. The model also includes the presence of crystallites of the pure components. By fitting the calculated and measured spectra the structural p…
Far-infrared absorption coefficients of silicon crystals grown by the Czochralski method (CZ) and by the floating-zone method (FZ) in the range of 20–200 cm−1 were obtained from transmission measurements at two different thicknesses, allowing for the effect of the multiple internal reflection. The CZ and FZ specimens…
Calculations of the atomic and electronic structure of Ca-Mg glasses and of the crystalline intermetallic compound ${\mathrm{CaMg}}_{2}$ are presented. For the glasses, the calculations are based on realistic models of the atomic structure constructed by a molecular-dynamics computer simulation linked to a steepest-de…
The structure of $\ensuremath{\mu}$-Mn${\mathrm{Al}}_{4}$ has been determined by single-crystal x-ray diffraction. The space group is $\frac{{P6}_{3}}{\mathrm{mmc}}$, $a=19.98(1)$, $c=24.673(4)$ \AA{}A, with 563 atoms per cell (average), and the formula is Mn${\mathrm{Al}}_{4.12}$. Parts of the structure resemble that…
We have examined the electronic and structural properties of elemental copper using pseudopotentials and a local-orbital basis consisting of Gaussians. We find we can use a much weaker ionic pseudopotential to describe accurately the measured band structure, cohesive energy, lattice constant, and compressibility of co…
A new approach is described for the prediction of the optical properties of amorphous tetrahedrally bonded materials over the entire experimental energy range, in which a model of the imaginary part of the dielectric constant is assigned and the real part is obtained by the Kramers–Kronig transform. Tight-binding theo…
We have successfully collected size-selected Au clusters from a liquid-metal ion source onto amorphous carbon substrates. The systematics of the photoemission spectra show that there was no significant fragmentation or coalescence of clusters with seven or more atoms. We estimate the transition from metallic to local…
Molecular dynamics simulation has been performed with an assembly of n-alkane-like chains subject to potentials restricting bond lengths, bond angles, and trans–gauche dihedral angles and interacting with neighboring chains according to a truncated Lennard-Jones potential. The system, on stepwise cooling under constan…
The temperature-dependent microscopic structure of plasma-deposited a-C:H and magnetron-sputtered a-C films, in situ sputter cleaned by argon bombardment, has been investigated by near-edge (NEXAFS) and extended (EXAFS) x-ray-absorption fine-structure studies. We find that the microscopic structure of the two films be…