Materials Literature
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Raman scattering measurements have been carried out on poly(propylene oxide) complexed with NaCF3SO3 salt of concentration O:M=30:1 (where O:M is the PO:Na ratio) over a temperature range of 186–360 K in order to study ion–ion associations of the dopant salt and their temperature dependence. Splitting of the symmetric…
The gas-phase composition at the surface of a growing diamond film was measured as a function of the initial methane (CH4) fraction and, for a 2% methane fraction, as a function of added oxygen (O2). The results were modeled with a one-dimensional reactor flow code that includes diffusion and detailed chemical kinetic…
The role of phenyl-ring torsion angle in determining the nature of the ground and charged-defect states of polyaniline is explored. The coupling of the transfer integral between nitrogen atom and phenyl-ring constituents of the polyaniline chain to the dihedral angle of the rings competes with the substantial steric r…
The Raman spectra of α-GaPO 4 single crystals have been investigated. In the polarization measurements at room temperature under atmospheric pressure we observed seven new Raman lines, not observed so far. In addition, the measurements of the temperature and pressure dependences of Raman spectra show the results which…
High-strength and zero-strength defects have been observed for the first time in degenerate hybrid aligned nematic films. The defects possess complex asymmetrical structures, and their existence is the consequence of the splay cancelling principle. The relation between the strength of defects and the number of dark br…
We report a determination of the Raman-scattering efficiency for first- and second-order phonon lines in graphite. These measurements are of interest for the analysis of the Raman spectra of amorphous carbon films, materials of increasing technological interest.
The spherical and chromatic aberrations of a converging electron mirror are of opposite sign from those of electron lenses. This important property makes it possible in principle to compensate the aberrations of electron lenses by means of an electron mirror and to design electron microscopes based on a corrected opti…
High-resolution soft-x-ray photoemission spectra of the C 1s line of graphite have been analyzed to determine the various contributions to the linewidth and line shape. The natural lifetime width \ensuremath{\Gamma} is 210 meV, much larger than those of small molecules (for which \ensuremath{\Gamma}\ensuremath{\simeq}…
A simple variational calculation is presented for the ground-state energy of an electron-hole system confined in a microcrystal with finite potential barriers. It is shown that the effect of the penetration of the wave function outside the microcrystal is quite large in the strong-confinement region and is consistent…
A complete analysis of multilayer structures containing an arbitrary number of dielectric, metal, magnetic, and birefringent/dichroic layers is presented. An algorithm, based on simple 2×2 matrices, is derived which allows reflection, transmission, absorption, magneto-optic conversion, birefringence, and dichroism of…
The heats of solution of disordered phases and several stoichiometric compounds have been determined for 12 binary alloys of fcc metals using an analytic embedded-atom-method model with no adjustable parameters. The cohesive energy, vacancy formation energy, lattice constant, bulk modulus, and average shear modulus fo…
The thermodynamic and dynamic properties of a partially deuterated poly(ethylene-propylene)–poly(ethylethylene)(PEP–PEE) diblock copolymer containing 55% by volume PEP were characterized above and below the order–disorder transition (ODT) by small-angle neutron scattering (SANS) and rheological measurements, respectiv…
A model describing film growth from hyperthermal (\ensuremath{\sim}1--${10}^{3}$ eV) species impinging on substrates is presented. The model involves a shallow subsurface implantation process called ``subplantation,'' energy loss, preferential displacement of atoms with low displacement energy ${\mathit{E}}_{\mathit{d…
We present a first-principles pseudopotential study of the structural and electronic properties of \ensuremath{\beta}-${\mathrm{Si}}_{3}$${\mathrm{N}}_{4}$ and the hypothetical compound \ensuremath{\beta}-${\mathrm{C}}_{3}$${\mathrm{N}}_{4}$. \ensuremath{\beta}-${\mathrm{C}}_{3}$${\mathrm{N}}_{4}$, which is ${\mathrm{…
Absolute total electron scattering cross sections for water molecules measured in the 25-300 eV incident energy range using a linear electron transmission device are presented. The results are compared with previous data.
Cross sections of RF sputtered MoS 2 thin films are investigated using lattice resolution transmission electron microscopy and electron diffraction. The results are compared with X-ray diffraction measurements. The films have a (001) texture (type II) in the first nanometres near the interface and a conventional (100)…
The off-centre displacement delta of a Li ion in KTaO3 and the surrounding lattice distortion is calculated using a nonlinear shell model developed for the pure lattice. The method of the static lattice Green function is applied and the range of the Li dipole forces is limited to a few lattice constants. A short range…
We report high-resolution angular-resolved electron-energy-loss measurements of the cross section of surface-plasmon excitation. The intensity shows a pronounced minimum as a function of exchanged momentum near ${\mathit{q}}_{\mathrm{\ensuremath{\parallel}}}$=0 whose position depends on impact energy and angle of inci…
The preparation and properties of K 2 Ca 2 (SO 4 ) 3 doped with Eu are described. The phosphor is five times more sensitive than CaSO 4 :Dy. It has a linear response, simple glow curve, emission peaking at 415 nm, negligible fading and excellent reusability. It is claimed that this phosphor can replace CaSO 4 :Dy.
A three-dimensional random-tiling icosahedral quasicrystal is studied by a Monte Carlo simulation. The hypothesis of long-range positional order in the system is confirmed through analysis of the finite-size scaling behavior of phason fluctuations and Fourier peak intensities. By investigating the diffuse scattering w…