Materials Literature
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We have determined the surface-plasmon modes of interacting spherical particles as a function of the particle radii, the separation R, and the dielectric constant of the surrounding medium. The coupling between the two particles produces a shift of all surface-plasmon eigenfrequencies leading, in the case of Al partic…
An upper bound of the diffraction efficiency of diffractive elements that only influence the phase of the illumination wave is derived. The derivation only utilizes the specification of the desired diffraction pattern. It is independent of the technique to design and fabricate the diffractive element. The theory is ba…
In order to probe into the growth mechanism of sprayed SnO2 films, the films were deposited with different Sn concentrations in the precursor solution. The orientational properties were determined using grazing incidence x-ray diffraction. The preferred growth changed from [110] to [200] direction as the Sn incorporat…
Abstract Sequences of high Bragg-angle (0B = 74°) double-crystal X-ray topographs taken at the SRS (Daresbury, U.K.) have yielded precise measurements of lattice parameter differences between growth sectors of different crystallographic forms in a large undoped synthetic diamond whose type Ib infrared absorption spect…
Steady-state photoluminescence, time-resolved photoluminescence, and x-ray photoelectron spectroscopy have been used to study the electrical and chemical properties of GaAs surfaces exposed to inorganic and organic sulfur donors. Despite a wide variation in S2−(aq) concentration, variation of the pH of aqueous HS−solu…
Binary blends of a lamellar poly(styrene-b-isoprene) diblock copolymer and homopolystyrenes of various molecular weights self-assembled into highly ordered morphologies upon solvent evaporation. The equilibrium blend morphologies were studied by transmission electron microscopy and small angle x-ray scattering. The ty…
The 5T2(HS)→1A1(LS) intersystem crossing rates have been determined for a number of Fe(II) coordination compounds between 10 and 270 K using time-dependent optical spectroscopy. Strong deviations from Arrhenius kinetics with nearly temperature independent tunneling at low temperatures and a thermally activated behavio…
Zero-order gratings are grating structures with a period that is small compared with the wavelength of light. Only the directly transmitted or reflected light, the zero diffraction order, is nonevanescent and propagates in a distance from the grating. Thus the grating behaves like a slab of ordinary homogeneous materi…
The bond fluctuation model of polymer chains on lattices is used to study layers of polymers anchored with one end at a hard wall, assuming good solvent conditions and repulsive interactions between the monomers and the wall. Chain lengths from N=10 to N=80 and grafting densities σ from 0.025 to 0.20 are considered, b…
Boron atoms from Nd:YAG laser ablation of the solid have been codeposited with Ar/O2 samples on a 11±1 K salt window. The product infrared spectrum was dominated by three strong 11B isotopic bands at 1299.3, 1282.8, and 1274.6 cm−1 with 10B counterparts at 1347.6, 1330.7, and 1322.2 cm−1. Oxygen isotopic substitution…
The band structure of graphite with the hypothetical simple hexagonal structure has been investigated near the Fermi energy, using a tight-binding approximation. Some general features of the structure of the \ensuremath{\pi} bands in the neighborhood of the zone edge are obtained and are expressed in terms of appropri…
A detailed study of guided optical modes in planar heterostructures involving one or two media with negative dielectric constant is presented. The existence and the form of the solutions with respect to geometrical and physical parameters are derived. The cases of a metal between two dielectrics and a metal-dielectric…
Using density-functional calculations, we examine the electronic structure of magnetite in the spinel crystal structure in order to gain insight into the nature of the Verwey transition. The calculated cohesive and magnetic properties are in agreement with experimental results. The magnetic structure is analyzed using…
The results obtained in this study establish that liposome formulations incorporating a synthetic polyethylene glycol-derivatized phospholipid have a pronounced effect on liposome tissue distribution and can produce a large increase in the pharmacological efficacy of encapsulated antitumor drugs. This effect is substa…
Study of the heat-transport properties of actinide-based mixed oxides is of importance in nuclear technology. This paper describes laser flash technique studies of the thermal diffusivity and thermal conductivity carried out on thorium-lanthanum mixed oxide solid solutions covering a temperature range from 573 to 1573…
The microhardness H v of xZnO.(50-x)PbO.50B 2 O 3 glasses has been studied as a function of ZnO content and gamma dose. H v shows a maximum at about 15 mol.% ZnO. 11 B NMR suggests the formation of non-bridging oxygen ions in the borate network as ZnO is added in the PbO.B 2 O 3 glass. Both the density and the molar v…
Abstract Molecular‐mechanics calculations of the sexidentate coordinated complexes of the pendant arm macrocyclic hexaamines trans ‐ (L 1 ) and cis ‐6,13‐dimethyl‐3,4,8,11‐tetraazacyclotetradecane‐6,13‐diamine (L 2 ) reveal that the trans ‐isomer shows a preference toward small metal ions, whereas the L 2 may coordina…
It is shown that nonlocal separable potentials may be used to study bound states of particles in multicentre potentials. The binding energy is obtained in a closed form. The cases of H2 + ion and polymer chains are discussed in detail and results compared to experimental data.
Electron nuclear double resonance (ENDOR) experiments were performed on 14N (natural abundance) and 15N-enriched iron-sulfur Rieske protein in the ubiquinol-cytochrome c2 oxidoreductase from Rhodobactor capsulatus. The experiments proved that two distinct nitrogenous ligands, histidines, are undoubtedly ligated to the…
An infrared radiation pyrometer for transient temperature measurement and a photoelectric installation for micrometric length-change measurement were developed. After being heated by a CO2 laser pulse of 0.1 μs, the transient temperature-rise history and length change of thermal expansion of 20–50 μm Al films during t…