Resonant electronic-to-rotational energy transfer: Quenching of F (2P1/2) by H2 (j=0)
Coupled-channel calculations of cross sections for quenching of F (2P1/2) by H2(J=0) are carried out over an energy range of 0.135–1.565 kcal/mole. (AIP)
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Tautomeric equilibrium study of thiazolidine-2-thione. Transition metal complexes of the deprotonated ligand
The complexes of deprotonated thiazolidine-2-thione (ttz) with many transition metals have been prepared. Probable structures have been proposed for the complexes on the basis of chemical analysis, spectral data (infrared and visible), and magnetic susceptibility measurements. The ligand field parameters have been eva…
Lattice dynamics ofK2Pt(CN)4Br0.3.3.2D2O (KCP) studied by inelastic neutron scattering
The lattice-dynamical properties of the "quasi-one-dimensional conductor" ${\mathrm{K}}_{2}$Pt${(\mathrm{CN})}_{4}$${\mathrm{Br}}_{0.3}$.3.2 ${\mathrm{D}}_{2}$O (KCP) has been studied by neutron inelastic scattering at temperatures between 20 and 240 K with special attention to the relation to the partial three-dimens…
Domain Switching Behaviour of Ferroelastic LaNbO4and NdNbO4
Ferroelastic domain switching behaviour is observed in large and high quality LaNbO 4 and NdNbO 4 single crystals grown by the Czochralski method. The domain walls which are (10\bar2) and (201) twin planes move when a small stress is applied, and return to the initial positions when the stress is removed. This back -…
Transparent electrode properties of cadmium stannate
Thin films of semiconducting n-type cadmium stannate (Cd2SnO4) have been coated onto different substrate materials by rf sputtering. The films are transparent in the visible and near-infrared part of the optical spectrum and electrically conductive. Conductivities as high as 6500 Ω−1 cm−1 have been achieved. Transpare…
Thermoreflectance spectra of CdO: Band gaps and band-population effects
Thermoreflectance spectra of semiconducting CdO single crystals at 100\ifmmode^\circ\else\textdegree\fi{}K with carrier concentrations in the range (2-40) X ${10}^{18}$/${\mathrm{cm}}^{3}$ give 2.28 eV for the direct ${\ensuremath{\Gamma}}_{15}\ensuremath{-}{\ensuremath{\Gamma}}_{1}$ gap. Two indirect gaps are found:…
Heat capacity and thermal conductivity of hexagonal pyrolytic boron nitride
We have measured the heat capacity and thermal conductivity of the layered material hexagonal pyrolytic boron nitride from 2 to 10 K by a pulse-heating technique. The thermal conductivity has also been determined by a steady-state technique from 1.5 to 350 K. At low temperatures, the heat capacity has a ${T}^{3}$ depe…
The inversion parameter with respect to the space group of MgAl2O4spinels
The inversion parameter is determined for several samples by ESR. It is shown that MgAl 2 O 4 is partly inverse and that the cation distribution varies markedly from sample to sample. A possible correlation between the space group of spinels and the cation distribution is discussed.
Grain boundary cavitation under various states of applied stress
Abstract Submicrometre grain boundary cavities are produced in Nimonic 80A when plastic deformation in any of three different stress states is followed by a short anneal. Tension, torsion and compression specimens were plastically strained in a systematic manner and then annealed for 2 h at 750 °C. Detailed quantitati…
Isolation and Identification of the Characteristic Sweet-aroma Compounds in Refinery Final Molasses
The characteristic sweet-aroma components in refinery final molasses were isolated by using a combination of sensory evaluation, column chromatography and gas chromatography, and were identified by infrared spectrometry, mass spectrometry and color reactions. Identified were ethyl n-hexanoate, ethyl phenylacetate, phe…
Physical Chemistry of Crosslinking
Crosslinked cotton fabrics suffer significant losses in strength and abrasion resistance. In order to understand why these losses occur and also to reduce them, the physical chemistry of the process of crosslinking and the role of adsorption in the crosslinking reaction were studied. An attempt is made to relate adsor…
23—THE SIGNIFICANCE OF YARN TENSION IN OPEN-END SPINNING
The theortical relation between yarn-mass variation and the variation of yarn-spinning tension for open-end rotor-spinnig is derived, and it is shown experimentally that spinning-tension measurement represents a useful means of assessment of yarn irregularity.
Studies of Ostwald Ripening of a Model Silver Bromide Emulsion System
The influence of various factors on Ostwald ripening was assessed from studies of a mixture of two monodisperse emulsions.Successive batches of small crystals were ripened onto large crystals under a given set of conditions, and the final habit of the larger crystals was determined from electron micrographs. Hence a p…
Enthalpies of formation of Cr3+(aq) and the inner sphere complexes CrF2+(aq), CrCl2+(aq), CrBr2+(aq), and CrSO4+(aq)
We have carried out calorimetric measurements leading to ΔH f 0 = −60 kcal mol −1 for Cr 3+ (aq). Further calorimetric measurements have led to enthalpies of reaction of Cr 3+ (aq) with HF(aq), Cl − (aq), Br − (aq), and SO 4 2− (aq) to form the 'inner sphere' complexes CrF 2+ (aq), CrCl 2+ (aq), CrBr 2+ (aq), and CrSO…
Moelwyn-Hughes parameter of some diatomic crystals
The Moelwyn-Hughes parameter, C1 = [d(1/β)/dP]T and temperature derivative of adiabatic compressibility have been computed for f.c.c. and b.c.c. type ionic crystals with the central-force rigid-ion interaction model, and various methods of calculation. Some applications of the Moelwyn-Hughes parameter are discussed. A…
Isothermal Oxidation, of Uranium Monocarbide Powder under Controlled Oxygen Partial Pressures
The kinetics of isothermal oxidation of UC powder were studied at oxygen partial pressures between 7.0×10–−4 and 1.1×10–−2 atm in the temperature range from 400 to 1,400°C with use made of thermogravimetric techniques. Oxidation rates at the initial stage were observed to be linear against the reaction time for all th…
Thermodynamische Untersuchungen an kondensierten Phasen
Abstract Die thermischen Ausdehnungskoeffizienten α P und die isothermen Kompressibilitäten β T von Acetylen, Chlorwasserstoff, Schwefelwasserstoff, Schwefeldioxid, Chlor‐Pentafluoräthan (CPFAE) und Chlor‐Trifluoräthylen (CTFAE) wurden in fester und flüssiger Phase gemessen. Die mit Festkörper‐ und Schmelzumwandlungen…
Morphology of organosilicon ladder polymers
Abstract The morphology of organosilicon ladder polymers was studied by various methods, including x‐ray techniques, diffraction of monochromatic polarized light, and electron microscopy. The morphology is discussed as a function of the chemical composition, the molecular weight, and the method of preparation.
The Raman Spectra of Perovskite-Structured Alkaline Earth Hafnates
The perovskite-structured titanates and zirconates have been extensively investigated using infrared and Raman spectroscopy. However, very few papers have been published related to the vibrational spectra of hafnium-containing compounds. McDevitt and Baun reported the infrared absorption spectrum of hafnium dioxide, w…
Corrosion of Lead Alloys at High Anodic Potentials
The corrosion of expanded grids of lead‐antimony, lead‐calcium, and lead‐calcium‐tin alloys maintained at constant high float charge was measured metallographically. Linear growth rates were determined for oxide growth on all three alloys. X‐ray scans and maps served to locate the presence of at the interfaces and in…