Materials Literature
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It is not clearly understood how and why the Raman intensity increases drastically with an increasing chain length of polyenes. We therefore investigated the vibrational intensities of the C=C stretching vibrational modes of four polyene systems of X–(HC=CH)n–Y, where X/Y=H/H, H/NH2, H/NO2, and NH2/NO2. The investigat…
An accurate width is determined for the valence band of diamond by imaging photoelectron momentum distributions for a variety of initial- and final-state energies. The experimental result of 23.0\ifmmode\pm\else\textpm\fi{}0.2 ${\mathrm{eV}}^{2}$ agrees well with first-principles quasiparticle calculations (23.0 and 2…
We report on the lattice location of Er in Si using the emission channeling technique. The angular distribution of conversion electrons emitted by the decay chain ${}^{167}\mathrm{Tm}$ $({t}_{1/2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}9.25\phantom{\rule{0ex}{0ex}}\mathrm{d}){\ensuremath{\rightarrow}}^{167m…
We use ab initio and parametrized calculations to investigate the morphology and structural stability at the growing edge of multiwall carbon nanotubes. We find that these open-ended structures are stabilized against dome closure by strong covalent bonds connecting the exposed edges of adjacent walls. Growth at the op…
We report on the first measurements of thermal conductivity in the superconducting state of $(\mathrm{TMTSF}{)}_{2}{\mathrm{ClO}}_{4}$. The electronic contribution to heat transport is found to decrease rapidly below ${T}_{c}$, indicating the absence of low-energy electronic excitations. We argue that this result prov…
The effect of antioxidant on the reaction mechanism of chemical crosslinking of polyethylene (PE) with dicumyl peroxide (DCP) at high temperatures was investigated by electron spin resonance (ESR). The antioxidant reacts with the alkyl radicals in PE formed by the thermal decomposition of DCP above 120°C, and disturbs…
Ausgehend von einem Diphosphazen als molekularem Precursor konnte erstmals phasenreines HP 4 N 7 synthetisiert werden. Die Strukturaufklärung gelang durch Pulver‐Röntgenbeugungsanalyse unter Verwendung von Synchrotronstrahlung. Rechts ist ein Ausschnitt aus der Kristallstruktur gezeigt. magnified image
Single crystals of doped with molar concentrations of between 0.1 and 20% have been synthesized by the hydrothermal method, and studied by absorption, excitation and luminescence spectroscopy at temperatures down to 4 K. The observed spectral features were consistently assigned with reference to those of the correspon…
We present a generalization of dissipative particle dynamics that includes shear forces between particles. The new algorithm has the same structure as the (isothermal) smoothed particle dynamics algorithm, except that it conserves angular momentum and includes thermal fluctuations consistently with the principles of e…
We study the exciton-phonon coupling in spherical quantum dots (QD's) of cubic semiconductors. Both the Fr\"ohlich and deformation interactions are considered with allowance for all types (LO, ${\mathrm{T}}_{2}\mathrm{O}$, ${\mathrm{T}}_{1}\mathrm{O}$, and SO) of optical phonons. The matrix elements of one-phonon tran…
Complex permeability spectra μ*(=μ′−iμ′′) in a Ni–Zn ferrite was studied in the frequency range from 10 kHz to 3 GHz under dc magnetic field up to 1000 Oe. In the absence of a dc magnetic field, the μ′ spectrum has a frequency dispersion above 1 MHz; the μ′′ spectrum has a maximum at about 2 MHz. This feature can be d…
omega-Methacryloyloxyalkyl phosphorylcholine (MA-PC) polymers which have been synthesized with attention to the surface structure of a biomembrane show excellent blood compatibility, i.e., resistance to protein adsorption and blood cell adhesion. To clarify the stability of platelets in contact with the MAPC polymer s…
We report results of a molecular dynamics study of liquid glycerol at the experimental density and at a series of elevated densities corresponding in our model to pressures of up to 0.7 GPa. We find that the degree of hydrogen bonding increases with increasing pressure over the range studied, and that the width of the…
A simple electrostatic model of the adsorbate–adsorbate interaction of hydrogen atoms at a Pd–SiO2 interface is presented. The model predicts a hydrogen adsorption isotherm of the Temkin type. It is found that, in practice, an upper limit for the hydrogen response of a Pd-metal-oxide-semiconductor device exists. The v…
Rates of chemical reactions in an air bubble are calculated numerically under a condition of the single-bubble sonoluminescence (SBSL) and that of non-light-emission. In the calculations, effect of non-equilibrium evaporation and condensation of water vapor at the bubble wall and that of thermal conduction both inside…
Electron-energy-loss spectroscopy in a scanning transmission electron microscope has been used to study the interface plasmon peak (IPP) observed at the ${\mathrm{S}\mathrm{i}/\mathrm{S}\mathrm{i}\mathrm{O}}_{2}$ interface. A precise line-spectrum recording shows a shift of the interface plasmon peak from 7.8 to 6.8 e…
The photoluminescence intensity at 580 nm for 2--3 nm ZnS doped with ${\mathrm{Mn}}^{2+}$ (ZnS:Mn) increases after modification by acrylic acid (AA). ${\mathrm{Mn}}^{2+}$ electronic states are examined by electron paramagnetic resonance (EPR) spectroscopy. Signal I with $g=2.0024$ and hyperfine coupling constant $|A|=…
We study a highly supercooled two-dimensional fluid mixture via molecular dynamics simulation. We follow bond breakage events among particle pairs, which occur on the scale of the $\alpha$ relaxation time $\tau_{\alpha}$. Large scale heterogeneities analogous to the critical fluctuations in Ising systems are found in…
We have studied by means of ab initio calculations including electron correlation and cluster models the formation energies of a series of defects in bulk ${\mathrm{SiO}}_{2}$ and in silica glasses containing Ge impurities. The defects considered include oxygen vacancies, \ensuremath{\equiv}Si---Si\ensuremath{\equiv},…
Epitaxial Sm–Co(11̄00) and (112̄0) films have been grown by magnetron sputtering onto Cr(211) and (100) buffer layers, respectively. The Sm–Co(11̄00) films exhibit uniaxial in-plane anisotropies of ≈20–25 T and room-temperature coercive fields that increase to 4.1 T as the film thickness decreases to 75 Å. The 3 T coe…