Materials Literature
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A systematic study of the desorption behavior of Sb multilayers applied as a passivant to (001) GaAs is presented. Reflection high-energy electron diffraction, reflectivity, Auger electron spectroscopy, x-ray photoelectron spectroscopy, and thermal desorption data reveal unique and complementary information which can…
Plasma-enhanced chemical vapor deposition has been used for the deposition of diamond and diamond-like thin films during the last decade with great success. Here we present experimental evidence that a chemical vapor deposition technique can also be used to synthesize other forms of carbon including fullerenes and hyd…
Redox transmetallation ofTl(C5H4PPh2)with an excess of Sm in refluxing thf (thf = tetrahydrofuran) or Eu indme (dme = 1,2-dimethoxyethane) at room temperature gave thelanthanoid(II) compounds[Sm(C5H4PPh2)2](1) and[Eu(C5H4PPh2)2(dme)](2). Crystallization of (1) or[Yb(C5H4PPh2)2(dme)]with OPPh3 in dme yielded[Sm(C5H4PPh…
Room temperature absorption and reflectivity data are presented for Cd2P2S6 and Cd2P2Se6 crystals in the range of photon energies between 1.6 and 5.5 eV. For both compounds the characteristic feature of the optical absorption is that their absorption edge appears to correspond to an indirect allowed transition with an…
A simple model is presented to estimate the low-energy electron mean free path in transition metals and to calculate its spin dependence. In this model, the electron-scattering rate is directly related to the number of holes in the $d$ bands; its spin asymmetry is almost proportional to the spin magnetic moment. These…
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The theory of spin-restricted Brueckner orbitals for high-spin open-shell coupled-cluster wavefunctions is presented. The orbitals are based on single-excitation amplitudes constructed using the symmetric spin–orbital basis coupled-cluster method of Jayatilaka and Lee. It is shown how this approach may be easily imple…
The most stable of the three possible structural isomers of corrole is, according to theory, isocorrole, for which the title compound 1 is a model compound. The reductive McMurry coupling of the corresponding α,ω-tetrapyrroledialdehyde affords an entry to 1. The isocorrole derivative 1 has, like corrole, the propensit…
We report that the sign of the polarization of an epitaxial ferroelectric film can be determined from the interference between the x-ray scattering from the film and the substrate. X-ray scattering measurements of a 10 nm epitaxial PbTiO3 film grown by metal-organic chemical vapor deposition on a SrTiO3 substrate are…
Durch eine optimale Abstimmung der Donor‐Acceptor‐Stärken in heterocyclischen Methinfarbstoffen wie 1 kann der Cyaninzustand erreicht werden. Trotz nahezu verschwindender Polarisierbarkeiten zweiter Ordnung (β) setzt diese Chromophorklasse neue Maßstäbe für photorefraktive Anwendungen. Bereits bei einem Chromophorgeha…
It is argued that the model advanced by Lenef and Rand [Phys. Rev. B 53, 13 441 (1996)] for the nitrogen-vacancy center in diamond, exhibiting the 1.945-eV luminescence is incorrect. Lenef and Rand argue that the electronic ground state consists of two electrons occupying ${a}_{1}$ states localized on N and C, respect…
Für die Entwicklung von molekularen Schaltern sind Cobalt‐ und Mangankomplexe mit 1,2‐Benzochinon‐Liganden von großem Interesse. Diese Verbindungen haben elektronisch instabile Grundzustände, was zu Phänomenen wie gemischte Valenz, Spincrossover und Valenztautomerie führt. In jüngster Zeit wurde das elektronische Verh…
Absorption, emission, and excitation spectra of KMgF${}_{3}$ doped with Ce${}^{3+}$ have been measured in the near ultraviolet up to 180 nm. In this fluoroperovskite lattice, absorption of the Ce${}^{3+}$ impurity is found at energies higher than 4.4 eV. Broad-band emissions are measured at 350 nm and 275 nm which are…
Hydrothermally prepared zinc dihydroxy divanadate dihydrate crystallizes in the trigonal system (space group P\overline{3}m1). Its structure was solved ab initio from conventional X-ray powder data. Zn atoms occupy three of four octahedral sites in the close-packed layer of O atoms. These layers are connected by pyrov…
Abstract A large number of TADDOL (α,α,α′, α′‐ t etraaryl‐1,3‐ d ioxolan‐4,5‐ d imethan ol ) derivatives has been tested as chiral dopants for inducing conversion of nematic to cholesteric phases. With the Merck liquid‐crystal materials ZLI‐1695 and K15 , it was demonstrated that some TADDOLs have unprecedentedly high…
${\mathrm{V}}_{2}{\mathrm{O}}_{3}$ exhibits as a function of temperature a metal-insulator transition (MIT) associated with a structural and a magnetic transition, which we have studied with x-ray-absorption measurements of ${\mathrm{V}}_{2}{\mathrm{O}}_{3}$ at the V $2p$ and O $1s$ edge as well as photoemission measu…
Higher order correlation functions as observed in four-dimensional NMR experiments on glass-forming liquids are interpreted in terms of a simple model for molecular reorientations. Its key assumption is an intrinsic link between the rotational and structural relaxation of the liquid. It is shown that the introduction…
We have studied the photoluminescence (PL) mechanism of crystalline Si single quantum wells sandwiched between ${\mathrm{SiO}}_{2}$ layers by site-selective excitation spectroscopy. The asymmetric PL spectrum is observed in the red spectral region at low temperatures and can be divided into two PL bands. The peak ener…
We have studied the electronic structure of ${\mathrm{CrO}}_{2}$ by photoemission spectroscopy and specific heat measurements. The Cr $3d$ band shows a splitting into the upper and lower Hubbard bands with a small but finite density of states at the Fermi level, consistent with its metallic behavior. The small renorma…
Macrophages were elicited by the subcutaneous implantation of ultra high molecular weight polyethylene (UHMWPE) for periods of 2, 7, and 14 days in rats. Exudates of varying volumes were produced that was comprised of granulocytes, monocytes, immature and mature macrophages, and T-lymphocytes. No B-lymphocytes were ob…