The antiferromagnetic Mn2 molecule
ESR measurements are reported for Mn2 in kypton and xenon matrices at 4 °K.(AIP)
Materials Literature
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Manufacture of n-Butanol and 2-Ethylhexanol by the Rhodium Oxo Process and Applications of the Alcohols
The oxo process consists of the reaction between an olefin, carbon monoxide, and hydrogen, in the presence of a catalyst (rhodium or cobalt) to form an aldehyde with one more carbon atom than the starting olefin. R-CH=CH 2 + CO + H 2 Catalyst/ R-CH 2 -CH 2 CHO The only exception is with the cobalt catalyst when the st…
Correlation functions of amorphous multiphase systems
We give two general integral expressions for the first and second derivatives of the so-called stick probability functions which are commonly used in analyzing x-ray-scattering results. Then it is shown that by letting the length of the stick go to zero, the limit of the second derivative can be expressed in terms of…
Raman scattering cross section of adsorbed pyridine molecules on a smooth silver surface
We have determined the Raman scattering cross section of pyridine molecules adsorbed on a "smooth" surface of silver prepared and characterized in an ultrahigh-vacuum chamber. The Raman intensity of the 1004-${\mathrm{cm}}^{\ensuremath{-}1}$ line of adsorbed pyridine was calibrated against the scattering intensity of…
Semiclassical image potential at a solid surface
A surface dielectric function of a semi-infinite plane-bounded metal is defined in the spirit of the plasmon-pole dielectric function of the bulk. It is modeled in such a way that the surface-plasmon dispersion relation is recovered for small momentum transfer. This function is employed to compute the image potential…
Investigation of the vibronic properties ofCu3VS4,Cu3NbS4, andCu3TaS4compounds
Infrared-reflectivity results on ${\mathrm{Cu}}_{3}$V${\mathrm{S}}_{4}$ and Raman scattering data as a function of temperature and hydrostatic pressure for ${\mathrm{Cu}}_{3}M{\mathrm{S}}_{4}$ (with $M=\mathrm{V},\phantom{\rule{0ex}{0ex}}\mathrm{N}\mathrm{b},\phantom{\rule{0ex}{0ex}}\mathrm{T}\mathrm{a}$) are reported…
Band structure and localization in incommensurate lattice potentials
A metal-insulator transition was found by Aubry in a one-dimensional tight-binding model containing a modulation potential incommensurate with the crystal lattice. In this article the extended bandlike states that occur in the metallic regime are studied using a quasiclassical approach. Near the metal-insulator transi…
Light scattering study of boron nitride microcrystals
Raman scattering and x-ray diffraction measurements are used to correlate finite-size effects on the Raman spectra of nonpolar vibrational modes in BN. The BN microcrystalline samples used exhibited domain sizes varying from 4.4 to 78.5 nm in the plane and 1.5 and 47.5 nm perpendicular to the planes. The Raman measure…
Thermally stimulated currents in polyvinylidene fluoride. I. Unstretched alpha -form PVDF
An unstretched alpha -form specimen of polarised PVDF shows four TSC peaks designated P 1 , P 2 , P 3 and P 4 in ascending order of temperature. The P 1 and P 2 peaks are associated with the dipolar depolarisation due to the alpha a and alpha e relaxations, respectively. The P 3 and P 4 peaks may both be attributed to…
The Influence of Molecular Host Lattices on Electronic Properties of Orbitally (Near‐) Degenerate Transition Metal Complexes
Abstract Transition metal complexes often have low‐lying excited electronic states and, as a consequence, tend to be electronically labile, i.e. , their electronic properties exhibit pronounced sensitivity to external perturbations. Often drastic changes in various spectroscopic properties indicating substantial elect…
High resolution infrared and visible luminescence spectra of ReCl62-and ReBr62-in cubic crystals
The high resolution infrared luminescence spectra of ReCl6 2- in K2PtCl6 and of ReBr6 2- in Cs2ZrBr6 have been measured between 10 000 cm-1 and 3000 cm-1 at liquid helium temperatures. Comparison with the luminescence spectra in the visible region has enabled nine luminescence transitions to be observed in the bromide…
Electronic structure of NiO
Non-empirical calculations of the electronic structure of NiO and related compounds have proven to be problematic, in that NiO is an insulator both above and below the antiferromagnetic ordering temperature (TN approximately 525K) with a gap of approximately 4 eV. This is so despite the partly filled d-band on the Ni…
Absolute Measurement of the (220) Lattice Plane Spacing in a Silicon Crystal
The (220) lattice plane spacing of an almost perfect crystal of silicon was measured by means of a combined scanning ($\mathrm{LLL}$) x-ray interferometer and a two-beam optical interferometer. From 170 measurements, a value ${d}_{220}=(192015.560\ifmmode\pm\else\textpm\fi{}0.012)$ fm results in vacuum at 22.50\ifmmod…
Application of Differential Anomalous X-Ray Scattering to Structural Studies of Amorphous Materials
A differential anomalous x-ray scattering technique has been developed for structural studies of disordered and amorphous systems. The results on amorphous Ge${\mathrm{Se}}_{2}$ are consistent with the twofold coordination of Se and the fourfold coordination of Ge. The results on amorphous GeSe are consistent with thr…
On the morphology of melt-crystallized polyethylene - II. Lamellae and their crystallization conditions
Abstract The microstructure of melt-crystallized linear polyethylene has been correlated with the variables of crystallization for most readily attainable conditions. All samples are filled with well defined lamellae with an average chain inclination of about 35° to lamellar normals. The lamellar thickness depends up…
On the morphology of melt-crystallized polyethylene. III. Spherulitic organization
Abstract The lamellar microstructure of a wide range of melt-crystallized polyethylenes has been examined in the context of spherulitic organization. Radial continuity is achieved through lamellar continuity. In the simplest cases ridged or planar sheets grow outwards along b, maintaining their identities over distan…
On the morphology of melt-crystallized polyethylene - I. Lamellar profiles
Abstract The morphology of melt-crystallized polyethylene has been surveyed, and it has been revealed that all specimens are highly lamellar. Classification of the textures is possible in terms of the lamellar profiles in b-projection, i. e. down the radii of spherulites. For polyethylene crystallized as the orthorh…
ChemInform Abstract: THE SYSTEMS ZNO‐FE2O3‐SNO2 AND MGO‐FE2O3‐SNO2 AT 1060 °C
Abstract Die Phasenbeziehungen in den Titelsystemen werden unter besonderer Berücksichtigung der Sn‐ Spinellbildung untersucht.
Wear of anodized aluminum-polymer lithographic printing plates
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWear of anodized aluminum-polymer lithographic printing platesJohn W. Noble III and Henry Leidheiser Jr.Cite this: Ind. Eng. Chem. Prod. Res. Dev. 1981, 20, 2, 344–350Publication Date (Print):June 1, 1981Publication History Published online1 May 2002Published inissue 1 June…
Mössbauer Study of the Perovskite Compound RbFeF3: Magnetic Structure in the Phase below 39 K and Temperature Dependence of Hyperfine Parameters below the Néel Temperature
The Mössbauer spectroscopy is applied to the perovskite compound RbFeF 3 . It is concluded that in the phase realized below T 1 (39 K) the spontaneous magnetization originates in a canting of the spins, i.e. the spins are almost along a pseudo-cubic [011] axis but cant by about 6° from the [011] axis, yielding spontan…