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The Raman spectra of the two crystalline modifications of polyglycine, I and II, and of N-deuterated polyglycine II have been recorded. The results of a normal-coordinate analysis of polyglycine II and N-deuterated polyglycine II are presented along with the phonon dispersion curves of polyglycine II. Assignments are…
A model for the photodissociation of ICN in its lowest continuum is developed and is used to predict the partitioning of available energy between translational, rotational, and vibrational energies of the recoiling fragments. The model is based on three major assumptions: (i) that only one upper electronic state is in…
Computerized analysis of shear failure at initial fragment collision during trifragment rotor disk interaction with containment rings
Abstract Since 1955 we have used lithium aluminum hydride for qualitative and quantitative analysis of the polysulfide content of various types of rubber vulcanizates. The first results were of qualitative or semiquantitative value, but by 1959 we felt that the method was revealing quantitative information. This work…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPulse radiolysis studies of deaerated alcoholic solutions of alkali halides and potassium hydroxideShigeyoshi Arai, Akira Kira, and Masashi ImamuraCite this: J. Phys. Chem. 1970, 74, 10, 2102–2107Publication Date (Print):May 1, 1970Publication History Published online1 May 2…
Homogeneous glasses are formed in the Bi 2 O 3 ‐P 2 O 5 system up to 35 mol% (63.8 wt%) Bi 2 O 3 . In property vs composition plots, the thermal expansion coefficient and tan δ exhibit minima, and hardness and activation energy for conduction show maxima at about 20 mol% Bi 2 O 3 . The deformation temperature of the g…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnomalous temperature dependence of isotropic proton nuclear magnetic resonance shifts in paramagnetic chromium(II) and cobalt(II) complexesGerd N. La Mar and Gerald R. Van HeckeCite this: J. Am. Chem. Soc. 1970, 92, 10, 3021–3028Publication Date (Print):May 1, 1970Publicati…
Abstract The physical creep of unfilled natural rubber vulcanizates, prepared with different vulcanizing systems, has been studied. For each of the three vulcanizing systems chosen there is a strong dependence of creep rate on crosslink density, but the rates for accelerated sulfur vulcanizates are two or three times…
The wavelengths of the 4 f -5 g transitions of the alkali metals as emitted from a hollow-cathode lamp have been measured, and the term values derived from the observations are compared with those predicted by the polarization formula.
Observations have been made of the electrical conductivity as a function of time in single-crystal Bi 2 Te 3 during copper plating. The diffusion coefficient along the basal planes is so high that the copper is deposited internally. It has been found that there is a saturation effect which depends on the plating curre…
Th e co nce pt " de n s it y of s ta tes" ca n be give n many differe nt mea nin gs wh e n we go beyond th e o nee lectron app rox imation. In thi s s ur vey we con ce ntrate on th e de fin iti o n ti e d to excit ati on pro cesses, wh e re one e lec tron is added or re mov e d from the solid. We di sc uss the o ne-pa…
A new method of predetermining corona losses under rain is suggested. Instead of setting up empirical formulas based on experimenting according to customary proceedings, a quantitative analysis of the loss mechanism is discussed. In this way networks of losses which are valid for any kind of conductor or line are obta…
Abstract Natural rubber-sulfur-diphenylguanidine vulcanizates were allowed to react with triphenylphosphine under nitrogen to convert polysulfidic crosslinks principally to di- and monosulfidic crosslinks and to assess the effect of this change in the chemical nature of the crosslinks on tensile strength, flex life, a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of tetra-.mu.-thiobenzoato-dinickel(II)-ethanol, [Ni(PhCOS)2]2EtOHGordon A. Melson, Peter T. Greene, and Robert F. BryanCite this: Inorg. Chem. 1970, 9, 5, 1116–1122Publication Date (Print):May 1, 1970Publication History Published online1 May…
An over-all view of the solution luminescence of metal complexes is given. The three major classes of emission are examined in moderate detail including brief discussions of theoretical considerations. These are attuned to the problem of predicting which metal ion—ligand combinations should form luminescent compounds.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-pressure synthesis of rare earth polysulfidesAlan Wendell Webb and Howard Tracy HallCite this: Inorg. Chem. 1970, 9, 5, 1084–1090Publication Date (Print):May 1, 1970Publication History Published online1 May 2002Published inissue 1 May 1970https://pubs.acs.org/doi/10.102…
Summary The formation and structure of glass is described and elementary wave-mechanics is used to show that, despite the disordered liquid-like configuration, electron energy-bands will nevertheless be formed in semiconducting glasses. The main effect of the disordered structure is to cause the formation of a high de…
The variation of total normal emittance as a function of oxide thickness on a metal sub strate is investigated experimentally for Al-Al2O3 and Cu-CuO systems. The measurements are made using a comparative black-body technique. Over the range of aluminumoxide thicknesses investigated (1.2μ–86.4μ) the total normal emitt…
Presented in this paper are some new analytical results for two exchange-coupled magnetic thin films. The formulation of the problem which is used is similar to that of Goto et al., who reduced the determination of the magnetic configuration of the films in the presence of an external magnetic field to the evaluation…
Static magnetic susceptibilities of simplified model vibronic systems where non-Kramers paramagnetic ions in triplet ground state interact either with localized tetragonal modes of vibration with sharp frequency spectrum at ω (localized model), or with tetragonal modes composed of the superposition of phonons with con…