Materials Literature
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The values of Slater–Condon (F2, F4, F6) and Racah (E1, E2, E3) interelectronic repulsion and Landé (ζ4f) spin–orbit interaction parameters have been computed from already observed visible and near infrared absorption spectra of 24 Nd3+ complexes. Using these parameters the energies of 27 energy levels of each complex…
The intramolecular contribution to the entropy of fusion of crystalline polymers is treated through calculation of the change in configurational entropy on melting of a single isolated polymer chain. Perfect backbone conformational order is assumed in the crystalline polymer chain, and the configurational entropy of t…
The ‘weak-beam’ technique of Cockayne, Ray and Whelan (1969) for resolving very closely spaced dislocations in the electron microscope has been applied to the dissociation of BZ-type superlattice dislocations in highly ordered Fe-35 at. % Al. By plotting the separation of the partials as a function of orientation a va…
The second-order perturbation method of Parmenter and the theories of Kane and of Halperin and Lax are employed to calculate self-consistently the conduction band density of states in heavily doped n-type GaAs using a screened Coulomb potential for impurity atoms. The three models all show that the total number of sta…
Boltzmann's equation is solved for electrons in a one-dimensional superlattice under the influence of a uniform electric field; an energy independent scattering time and nonspherical energy bands are assumed. The current density-electric field characteristic shows negative differential conductivity at fields of 103−10…
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.…