Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
In order to clarify the role of hydrogen in diamond synthesis using a microwave plasma in a CO/H2 system, carbon films were grown by varying hydrogen mole fractions in a CO/H2/He microwave plasma. The correlation between film properties and plasma species was investigated through film characterization and plasma emiss…
The dielectric relaxation function is defined as the transient current generated by the application of a unit voltage. In analogy with viscoelasticity, a second relaxation function can be defined as the transient voltage generated by the application of a unit current. Each of these functions generates its own distribu…
The uniaxial magnetic crystalline anisotropy of Pd 1- x Fe x in tetragonal L1 0 -type ordered phase (\(0.38\lesssim{x}\lesssim0.50\)) was obtained from magnetization curves of quasi-single crystal samples in a magnetic field up to 100 kOe. The first anisotropy constant K u1 at 4.2 K of stoichiometric composition ( x =…
High-temperature gaseous equilibria among the species Th, ThCl, ThCl2, and ThCl3 were studied by mass spectrometry over broad temperature ranges; both enthalpy and entropy data were derived by the second law procedure. In addition, the sublimation of ThCl4 was studied by the torsion-effusion method and the thermodynam…
The photodissociation of axial ligands from six-coordinate nickel(II) porphyrins in solution has been studied by transient absorption spectroscopy with subpicosecond resolution. Our observations indicate that the deligation process takes place during the first several picoseconds following optical excitation of the ma…
Calculations of the propagation of high-energy phonons introduced into a crystal at T=0 K are presented. The phonons are assumed to undergo elastic scattering and anharmonic decay processes. We show that in addition to the ``quasidiffusion'' component to the phonon propagation (discussed previously by Levinson and co-…
Spectroscopic measurements of fluorescence and absorption in an erbium-doped fiber permit the evaluation of the Stark-level energies of the (4)I(15/2) and (4)I(13/2) manifolds in Er:glass. The data permit the allocation of the individual laser transitions associated with the room-temperature gain spectrum of erbium-do…
The laser fluorescence excitation spectra and single vibronic level fluorescence spectra have been measured for jet-cooled tropolone (–OH) and tropolone (–OD). The ν′11(a1), ν12(a1), and ν′19(a2), modes have been newly identified in the excitation spectrum of tropolone (–OH), in addition to the previously observed ν13…
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…