Materials Literature
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The Hall effect and the magnetoresistance of ${(\mathrm{TMTSF})}_{2}$Cl${\mathrm{O}}_{4}$ have been measured at temperatures from 0.08 to 10 K and in magnetic fields to 22 T. The low-temperature data suggest a series of transitions induced by an orbital effect from the magnetic field which progressively reduce the car…
Holes are produced inside a thin layer of magnetic fluid with use of monodisperse polystyrene spheres with diameters in the micrometer range. With an external magnetic field an apparent magnetic dipole will be associated with each hole as a result of the displaced fluid. The apparent dipolar interactions between the s…
The observation of macroscopic collective behavior in a nematic liquid crystal doped with magnetic grains is reported. This behavior is manifested as a uniform molecular orientational distortion of the entire matrix upon the application of external magnetic fields as low as 1 G. The dependence of the distortion on fie…
Absorption, luminescence characteristics, and stimulated emission parameters of Nd3+ ions in the wide temperature region of a full concentration series of (La1−xNdx)3Ga5SiO14 single crystals are studied. Luminescence intensity characteristics are analyzed and transition cross-section at the laser wavelengths of two 4F…
A large decrease in the radiation-induced conductivity of polyethylene terephthalate was produced upon doping films with an electron acceptor molecule. Transient x-ray photoconductivity data verify that this impurity acts as a deep trap. Charge transfer occurs in the doped dielectric which may be associated with this…
The transmittances and reflectances of cultured crystalline quartz, Suprasil, Suprasil W, and Infrasil were compared over the wavelength region from 2 to 1000 μm. The high-water content of Suprasil and the low-water content of cultured crystalline quartz, Suprasil W, and Infrasil were determined by their transmittance…
Reflectance and transmittance of electromagnetic radiation from an exponentially graded-index multilayer dielectric structure are investigated theoretically. It is shown that such a structure maximizes the optical transmission in the case in which this transmission is approximated by summing intensities. Transmittance…
The angular dependence of the high-field magnetoresistance anomaly in graphite is reported. The observed angular dependence is consistent with the functional form for the phase boundary of a charge-density-wave transition suggested by Yoshioka and Fukuyama. Sharp periodic features in the resistivity occurring after th…
The surface electronic structure of single-crystal ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ has been studied by using ultraviolet and x-ray photoelectron spectroscopy. Both nearly-perfect surfaces and surfaces containing point defects have been prepared, and the influence of ${\mathrm{O}}_{2}$ and ${\mathrm{H}}_{2}$O on b…
Calculations of 4f → 4f electric dipole intensity parameters are reported for six different lanthanide (III) systems whose solid-state structures and optical spectra have been well characterized. In each case, the ligands are considered to have isotropic electronic charge distributions, and the 4f → 4f intensity param…
The Raman spectra of thin film, and powdered crystalline forms of CuTCNQ have been studied and analyzed in connection with their electronic spectra and vibrational normal coordinate analysis and molecular orbital results. Nonresonance and resonance Raman conditions have been obtained by using different sample forms an…
A metalorganic chemical vapor deposition process for preparing c-axis-oriented ZnO films in a simple system of the type commercially available for SiO2 deposition is described. The resulting layers are highly uniform in thickness and adhere to a variety of substrates. Film properties and structure are described briefl…
A general parametrization scheme for the electric dipole intensities of lanthanide 4f → 4f crystal-field transitions is proposed. This parametrization is sufficiently general to accommodate any 4f → 4f intensity mechanism based on the ‘‘one-electron’’ and ‘‘one-photon’’ approximations for lanthanide-ligand-radiation f…
The electronic structure of the organic conductors bis-tetramethyltetraselenafulvalene-$X$ [${(\mathrm{TMTSF})}_{2}X$] and bis-tetramethyltetrathiafulvalene-$X$ [${(\mathrm{TMTTF})}_{2}X$] has been investigated by means of polarized optical and infrared reflectance measurements. Analysis of plasma edges in reflectance…
Semiempirical self-consistent-field calculations are carried out on various polyenes with emphasis on defect configurations designed to simulate soliton and polaron excitations in polyacetylene. For defect-free polyenes, the calculated bond-length alternation ($\ensuremath{\Delta}r=0.106$ \AA{}) is in close agreement…
The heat capacity of a sample of zone-refined, high-purity p-terphenyl has been determined from 4 to 370 K in a fully automated high-resolution vacuum adiabatic calorimeter and from 320 to 580 K in a differential scanning calorimeter. The melting point of p-terphenyl is 487.0 K and the enthalpy of fusion is 35.3 kJ/mo…
A near-infrared reflectivity exceeding 60% at 2.5-μm wavelength has been observed for a polycrystalline, rf sputter-deposited electrochromic (EC) WO3 film in a deeply colored state. This reflectivity is considerably higher than that previously reported for a thermally evaporated EC-WO3 film that was crystallized by a…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Michael C. Hettrick and Stuart Bowyer, "Variable line-space gratings: new designs for use in grazing incidence spectrometers," Appl. Opt. 22, 3921-3924…
Clusters are produced in a free jet expansion of water vapor. Keeping constant the nozzle diameter (d=0.4 mm) and temperature (T=430 K), an increase in inlet vapor pressure from 1 to 5 bar produces an increase in mean cluster size from several tens to several thousands of molecules per cluster. An electron diffraction…
A complete study of the $\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}=\stackrel{\ensuremath{\rightarrow}}{0}$ optical phonons of the ferroelectric tetragonal PbTi${\mathrm{O}}_{3}$ as a function of hydrostatic pressure has been carried out using Raman spectroscopy. The coalescence, to the same frequency, of the hig…