Materials Literature
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X-ray-photoemission spectra of monoclinic, trigonal, and amorphous selenium have been first measured with the same photoelectron spectrometer in order to directly compare the valence electronic states of the three allotropes of selenium. It has been found that the $4p$ lone pair and the $4s$ band of monoclinic seleniu…
We present a new study of the surface-plasmon contribution to surface-enhanced Raman scattering from molecules adsorbed onto metallic gratings. To this end, we use a rigorous electromagnetic theory of diffraction, i.e., a theory in which the groove depth is not considered as a perturbative parameter. The rigorous feat…
Using a natural type IIb diamond, which is p-type semiconducting, as a substrate material, and implanting this diamond with carbon ions to induce n-type regions, diode and bipolar transistor action could be obtained. Owing to the geometrical positions of the collector, base, and emitter, which in this case were latera…
Optical bistable operation in the transmission characteristics of a nematic liquid crystal film is observed. The mechanism for the bistability is the self-focusing of light via optically induced molecular reorientations. The process occurs at very modest cw input laser power on the order of 0.3 W (intensity of ∼500 W/…
The periodic lattice distortion associated with a charge-density wave in $1T$-V${\mathrm{Se}}_{2}$ was investigated by x-ray diffraction. The charge-density-wave transition was observed at 110 K. From the observation of the satellite reflections the wave vector of the periodic lattice distortion was determined to be $…
Highly conductive films of zinc oxide have been prepared by rf magnetron sputtering deposition on a substrate suspended perpendicular to the target under an applied external magnetic field in pure argon gas. It is shown that a film with low resistivity (5×10−4 Ω cm) and high optical transmission (>85% between 4…
The bonding and spectroscopic properties of graphite are investigated by carrying out first-principles, self-consistent electronic structure calculations, and by comparing the results with high-resolution data from recent x-ray diffraction and angle-resolved photoemission measurements. The theoretical valence-charge d…
The ultraviolet photoemission and optical absorption spectra of pyrrole and polypyrrole are analyzed using the spectroscopically parametrized CNDO/S3 model. Calculated charge densities, bond orders, and orbital eigenvalues for pyrrole are compared with the extensive literature on this molecule. The densities of valenc…
Carbon fibers prepared from thermal decomposition of benzene at \ensuremath{\sim} 1100\ifmmode^\circ\else\textdegree\fi{}C are studied by Raman spectroscopy as a function of heat-treatment temperature. The structural ordering at each heat-treatment temperature is monitored by observation of both the Raman-allowed ${E}…
The crystallization of a Lennard-Jones liquid has been studied with molecular-dynamics techniques. In particular, the motion of the fcc (100) interface has been measured for a range of temperatures below the melting point. The crystallization rates are not limited by the mobility of atoms in the bulk liquid; measurabl…
Defect-state calculations on all-trans polyacetylene and polyparaphenylene have been performed in the framework of the adiabatic H\"uckel Hamiltonian with $\ensuremath{\sigma}$-bond compressibility. In polyacetylene, the study of the energetics of the separation of the radical (neutral defect) -ion (charged defect) pa…
The lattice parameters of the compound cadmium stanni-diphosphide (CdSnP 2 ) have been determined at different temperatures in the range 28 to 536 degrees C. From these data, the thermal expansion and the tetragonal distortion have been evaluated at various temperatures. The linear thermal expansion coefficients along…
The adiabatic elastic constants C 11 , C 12 and C 44 of 7 LiH and 7 LiD have been obtained from measurements of ultrasonic wave transit times through single crystals over the range 4.2-300K. The temperature variation follows quite closely the approximation C ij (T)=C ij (0)(1-D epsilon ). The anisotropy factor A=C 44…
The properties of electron-irradiation-induced defects in VSe 2 are studied by electronic transport, magnetic susceptibility and lattice parameter measurements. A well defined magnetic defect exists in the irradiated samples and it is identified as a V interstitial between the VSe 2 sandwiches in analogy with the prev…
The low-lying particlelike excitations of a model linearly conjugated diatomic polymer, ${(A=B)}_{x}$, are found to be pairs of either spin-0 or spin-\textonehalf{} solitons with irrational charge values. The charge values and excitation energies are calculated as functions of the difference of the energy levels of th…
Abstract In Fortsetzung der früheren (1 10)‐Untersuchungen werden (100)‐Messungen in wäßrigen NaF ‐, NaClO 4 ‐ und KPF 6 ‐Lösungen analysiert, um Daten über die Struktur der Grenz‐ fläche Elektrode‐Elektrolyt zu erhalten.
A compact tritium removal equipment (TRE), assembled in a console with casters, has been developed for detritiation of air in a glovebox used for handling of several curies of tritium. The TRE was designed to remove gaseous tritium in the form of T2, HT and CH3T through oxidation with precious metal/alumina catalysts…
Article Zur Existenz und Einkristallzüchtung von Zn3BPO7 und Mg3BPO7? was published on November 1, 1982 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 160, issue 1-4).
The domain wall motion and localized power loss have been measured under applied tensile stress for individual grains in polycrystalline commercial grain-oriented silicon-iron. The variation of power loss with tension results show that the greatest reduction in loss occurs at the higher values of frequency and flux de…
Abstract The hydrophilicity of surface-active crown compounds and their change upon the addition of electrolytes were investigated by measuring the phase-inversion temperature (PIT), the phenol index, and the cloud point. Sodium chloride and potassium chloride were observed to raise the hydrophilicity of 15-crowns and…