Materials Literature
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We report a molecular dynamics simulation of the vapor deposition of amorphous ice on a cold surface. We compare the obtained structure with neutron scattering data of high and low density amorphous ice formed by pressure induced transformation of crystalline ice. The structure of our vapor deposited ice is intermedia…
A quantum size effect of nanometer-size CuI microcrystallites (nanocrystals) embedded in glass was investigated and was found to follow the strong-confinement model. Persistent spectral hole burning and thermally annealing hole filling phenomena were observed in samples (CuI nanocrystals in glass). Unusual luminescenc…
A channel waveguide on an erbium-doped phosphate laser glass was fabricated by a dry silver-film ion exchange technique, and its gain properties were studied experimentally. The propagation loss of the fabricated waveguide was 0.63 dB/cm at 1.3 μm. Er3+ concentration of 1×1020 ions/cm3 was chosen so that no concentrat…
The clean GaSb(100) surface exhibits a variety of reconstructions, including a c(2\ifmmode\times\else\texttimes\fi{}10), a c(2\ifmmode\times\else\texttimes\fi{}6), and a (1\ifmmode\times\else\texttimes\fi{}3)/c(2\ifmmode\times\else\texttimes\fi{}6), in order of a decreasing surface Sb/Ga ratio. Core-level photoemissio…
The electromigration short-length effect has been investigated by testing a two-level structure with Ti-AlCu-Ti stripes and interlevel tungsten (W) stud vias. This investigation represents a complete study of the short-length effect using a technologically realistic test structure. Lifetime measurements and resistance…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular-specific chromatographic detector using modified SERS substratesKeith T. Carron and Brian J. KennedyCite this: Anal. Chem. 1995, 67, 18, 3353–3356Publication Date (Print):September 15, 1995Publication History Published online1 May 2002Published inissue 15 September…
We report here a direct measurement of the spatially resolved atomic hydrogen concentration profiles during hot-filament-assisted chemical-vapor deposition (HFCVD) of diamond films. The ground-state hydrogen (1s 2S1/2) atoms generated in this process are monitored by an optical four-wave-mixing technique, third-harmon…
Using the Kondo lattice model with classical spins in infinite dimension, conductivity in the perovskite-type $3d$ transition-metal oxide (La,Sr)MnO$_3$ is theoretically studied. Green's functions as well as spontaneous magnetization are obtained exactly on the Bethe lattice as a function of temperature. Conductivity…
Amorphous carbon (a-C) and amorphous hydrogenated carbon (a-C:H) films are produced by 248 nm pulsed laser ablation of graphite and polycarbonate targets in high vacuum conditions. Plasma plumes generated by target irradiation with different laser fluences are investigated with laser induced fluorescence spectroscopy…
Using Monte Carlo dynamics and the Monte Carlo histogram method, the simple three-dimensional 27 monomer lattice copolymer is examined in depth. The thermodynamic properties of various sequences are examined contrasting the behavior of good and poor folding sequences. The good (fast folding) sequences have sharp well-…
We have studied the effect of erbium-impurity interactions on the 1.54 μm luminescence of Er3+ in crystalline Si. Float-zone and Czochralski-grown (100) oriented Si wafers were implanted with Er at a total dose of ∼1×1015/cm2. Some samples were also coimplanted with O, C, and F to realize uniform concentrations (up to…
A self-consistent fluid model has been used to analyze streamer arrival at the cathode and its transformation to the stationary cathode fall in a positive point–to–plane corona discharge in N2 at 26.7 kPa. The model is based on a description of the electron and the ion kinetics by one-dimensional continuity equations…
The relaxation processes of self-trapped excitons (STE's) in halogen-bridged mixed-valence metal complexes (MX-chain complexes) have been investigated by picosecond time-resolved luminescence measurements. The self-trapped exciton luminescence of [Pt(en${)}_{2}$][Pt(en${)}_{2}$${\mathrm{Cl}}_{2}$](${\mathrm{ClO}}_{4}$…
X-ray-absorption K-edge shifts of cobalt have been measured in ${\mathrm{Y}}_{2}$${\mathrm{Co}}_{17}$, ${\mathrm{YCo}}_{5}$, and ${\mathrm{YCo}}_{3}$ compounds whose crystal structures are derivatives of the ${\mathrm{CaCu}}_{5}$ structure. The edge shifts vary monotonically with the Y:Co ratio. We compare them with F…
A heteroquantum-dots (HQD) model for hydrogenated nanocrystalline silicon films (nc-Si:H) is proposed. The main features of our model are as follows. (i) the nanocrystalline grains and the amorphous counterparts in which they are embedded have very different band gap and band structures. As a result, they form heteroj…
We have performed both analytically and numerically a stability analysis of the silicon-electrolyte interface for the photoelectrochemical etching of n-type Si. The model incorporates the transport of holes in the semiconductor, ion diffusion in the electrolyte, together with surface tension of silicon. A careful phys…
Single-crystal diamond has been irradiated with 4-MeV carbon ions to doses in the range (0.5--130)\ifmmode\times\else\texttimes\fi{}${10}^{16}$ ions/${\mathrm{cm}}^{2}$. With increasing implantation damage, the triply degenerate one-phonon Raman mode at 1332 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ broadens and shif…
Bei der zur Entfernung des Tensids notwendigen Calcinierung stabil ist Ti‐TMS1, das erste hexagonal geordnete, mesoporöse Übergangsmetalloxid. Die Synthese dieses neuen Materials aus Phosphat‐Tensiden und Titanalkoxiden gelang durch eine modifizierte Sol‐Gel‐Methode. Die große innere Oberfläche, die enge Porenweitenve…
A mechanism for the compressive failure of soda-lime and borosilicate glasses is proposed based upon high-speed photography of impact on glasses. Shock loading was produced by the impact of a 50 mm diameter projectile so inducing shock states of one-dimensional strain in glass targets. The shock waves and failure fron…
The shot-noise power of a diffusive conductor in a presence of both strong inelastic electron-electron and electron-phonon scattering is calculated. It is shown that electron-electron inelastic scattering does not suppress shot noise strongly and the noise power has a universal form (\ensuremath{\surd}3/2)e\ensuremath…