Materials Literature
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Thirty different binary metal oxide glasses having the metaphosphate composition have been prepared containing cations from the following groups: alkali metals, alkaline earths, transition metals, and lanthanide and actinide metals. Far infrared absorption assigned to the cation vibration in its oxygen cage has been m…
This review outlines some relevant aspects of theoretical physics-molecular orbital and other calculation of the properties of point defects, symmetry and group theory, zero-phonon lines and the configuration coordinate diagram. The experimentally observed spectra can conveniently be divided into infrared (<1 eV), whi…
Light-scattering lineshapes in degenerate p-type silicon due to interference between one-phonon (discrete) and inter-valence-band electronic (continuum) scattering amplitudes are investigated quantitatively. The pseudopotential method is used for calculations of both the electronic band structure and electron-phonon i…
The formation of a polymer in a glow discharge is a complex phenomenon, and the interpretation of the formation mechanism is not at all clarified by the misapplication of the term "polymerization". The term "polymerization" is generally accepted to mean that the molecular units (monomers) are linked together by the "p…
Abstract Polymers can be obtained by subjecting an organic or organometallic vapor to the plasma created in an electrical glow discharge. By varying the plasma conditions such as pressure, monomer flow rate, power etc., not only films but also powder and oil are formed In this paper we shall consider both the mechanis…
We demonstrate here that nonlinear mixing of four surface-plasmon waves can be used to probe the Raman resonances of liquids. The results are in good agreement with theoretical prediction. The technique should be useful for surface studies.
Polymers can be obtained by subjecting an organic or organometallic vapor to the plasma created in an electrical glow discharge. By varying the plasma conditions such as pressure, monomer flow rate, power etc., not only films but also powder and oil are formed In this paper we shall consider both the mechanism of poly…
The intrinsic self-diffusion coefficient (D) for cesium-134 in a granitic melt containing 6.1 to 6.3 percent (by weight) of dissolved H(2)O is three to four orders of magnitude higher than the values reported for chemically similar but dry granitic glass. For the temperature interval 700 degrees to 800 degrees C and a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal stability of the triple helix of type I procollagen and collagen. Precautions for minimizing ultraviolet damage to proteins during circular dichroism studiesToshihiko Hayashi, Samantha Curran-Patel, and Darwin J. ProckopCite this: Biochemistry 1979, 18, 19, 4182–4187…
Phonon dispersion and density-of-states measurements are presented for VN, a cubic transition-metal compound with ten valence electrons. The acoustic phonons differ strongly from those observed in nine-valence-electron compounds. In particular, the prominent soft-mode region has moved from the interior to the boundary…
Acoustic emission release during tensile testing of polycrystalline aluminium is measured at room temperature. It is found that acoustic emission power and acoustic emission energy release at yielding and various strains during work- hardening increase with the inverse of the grain diameter. This dependence is explain…
The Raman spectrum of K(TCNQ) crystals has been obtained from 30 to 2300 ${\mathrm{cm}}^{\ensuremath{-}1}$. We have identified lattice modes at 70, 81, 110, 170, 229, and 295 (\ifmmode\pm\else\textpm\fi{}5) ${\mathrm{cm}}^{\ensuremath{-}1}$ and 13 intramolecular modes above 300 ${\mathrm{cm}}^{\ensuremath{-}1}$. The m…
By applying the method of symmetry breaking potential to Zwanzig's three direction model for liquid crystal, the nematic-smectic as well as isotropic-nematic transitions are investigated. Particular attention is paid to the effect of orientational fluctuation on the nematic-smectic A transition. It is shown that the n…
Previously reported spectra of nine triply ionized lanthanides in LaF3 are analyzed by using a parametrized C2 crystal-field Hamiltonian. Initial crystal-field parameters Bnm in the fitting procedure were obtained from point charge lattice sums Anm using previously derived ρn, where Bnm=ρnAnm. The largest rms deviatio…
The effect of impurities on the phase mode of CDW in a one-dimensional system is studied by taking account of the non-linearity of the problem. Most of the work is based on numerical simulations which are performed using a classical mechanical equation of motion for the phase mode. The existence of critical field for…
The Hartree–Fock instability of the SCF wave functions obtained for the quadruply bonded complexes Cr2(O2CH)4 and Mo2(O2CH)4 is studied at the ab initio level. Several cases of singlet, nonsinglet, and nonreal instabilities are found for each of these complexes at the experimental value of the metal–metal bond length.…
The intensities of plasmon-loss satellities in x-ray photoelectron (XPS) and electron-energy-loss (EEL) spectra of Mg metal have been determined. The method used has been described earlier in a similar study of aluminum. Intrinsic processes contribute 22% of the total plasmon intensity in the case of XPS core lines. T…
Abstract Red phosphorus is a highly effective flame retardant for polyolefins. The low additive levels of red phosphorus in polyethylene make it an attractive route to nonhalogen flame‐retardant systems. The mode of action of the red phosphorus has been investigated. Results indicate that the red phosphorus is effecti…
Abstract Glassy polycarbonate has been subjected to sub‐glass‐transition annealing and exposure to high‐pressure CO 2 . The subsequently measured solubilities of nitrogen, argon, and CO 2 in these specimens were found to be decreased by the former and increased by the latter. Annealing decreases the enthalpy of polyca…
The liquid-crystal alignment properties of gratings with a 1–10-μm period are described. Experiments are presented to compare the roles of interfacial interactions and surface topography in determining alignment. It is shown that grooves are neither necessary nor always sufficient to produce alignment. Interfacial for…