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The optical properties of crystalline and amorphous ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$ and ${\mathrm{As}}_{2}$${\mathrm{Se}}_{3}$ have been investigated from 1 to 14 eV. A simple rigid-band relationship connects the band structures of the two crystals, and the lowest-energy features observed near the interband thre…
In recent numerical calculations of the one-phonon inelastic neutron scattering in Bravais quantum crystals, the existence of an extra unexplained peak in the scattering cross section has been reported. It is suggested here that this peak is due to two-phonon production via an intermediate virtual phonon. An analytic…
The total inelastic cross section for the scattering of a coherent modulated electron beam, viewed as a single quantum state, is calculated. In addition to the conventional one-electron contribution, there is a many-electron interference contribution which, under proper conditions, can lead to a greatly enhanced cross…
The infrared spectra of B2Cl4 have been studied from 4000 to 33 cm−1 in the gaseous and crystalline states. The Raman spectra have been studied to 45 cm−1 in the liquid phase at several temperatures between − 30 and − 190°C, the sample being in a supercooled liquid or glassy state in the latter cases, and in the cryst…
Dielectric constants at 20, 30, 40, and 50°C have been determined for pure liquid dimethylsiloxane oligomers (CH3)3Si–[OSi(CH3)2]xOSi(CH3)3 having chain lengths corresponding to x = 3, 5, 7, and 9. Mean-square dipole moments 〈μ2〉, calculated from the Onsager equation, are in good agreement with predicted values based…
Diffusion of ${\mathrm{Ti}}^{44}$ into $\ensuremath{\beta}$-titanium has been measured as a function of pressure at approximately 1000 \ifmmode^\circ\else\textdegree\fi{}C using standard lathe-sectioning techniques. The diffusion coefficient is found to decrease with pressure, indicating a positive activation volume.…
Basic laws of motion of micropolar continuum are presented, and the adequacy of applying micropolar theory to liquid crystals is indicated. A set of constitutive equations is derived for nematic liquid crystals. Wave propagation problems are solved, and it is shown that the theoretical analysis is in good agreement wi…
The Raman spectrum of ${\mathrm{Ti}}_{2}$${\mathrm{O}}_{3}$ exhibits seven modes as predicted for the corundum structure. The persistence of all seven of these modes above the semiconductor-metal transition temperature indicates no space-group change on going through the phase transition. The ${A}_{1g}$ mode at 269 ${…
The EPR, optical absorption, and fluorescence spectra of Cr3+ in the spinel ZnGa2O4 have been measured and interpreted using a crystal-field model. The EPR experiments can be described by a spin Hamiltonian whose parameters are: 2D = + 1.048 ± 0.001 cm−1, g‖ = 1.9774 ± 0.0005, g⊥ = 1.9761 ± 0.0005. The broad band tran…
Infrared and Raman measurements of lattice vibrations in hexagonal Mo${\mathrm{S}}_{2}$ have been made over the combined range 20-4000 ${\mathrm{cm}}^{\ensuremath{-}1}$. Two infrared-active modes at 384 and 470 ${\mathrm{cm}}^{\ensuremath{-}1}$ and three Raman-active modes at 287, 383, and 409 ${\mathrm{cm}}^{\ensurem…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of the aconitate isomerase reactionJudith P. Klinman and Irwin A. RoseCite this: Biochemistry 1971, 10, 12, 2259–2266Publication Date (Print):June 8, 1971Publication History Published online1 May 2002Published inissue 8 June 1971https://pubs.acs.org/doi/10.1021/bi0…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPurification and kinetic properties of aconitate isomerase from Pseudomonas putidaJudith P. Klinman and Irwin A. RoseCite this: Biochemistry 1971, 10, 12, 2253–2259Publication Date (Print):June 8, 1971Publication History Published online1 May 2002Published inissue 8 June 197…
The Phillips---Van Vechten dielectric theory of binary tetrahedral compounds and Levine's bond-charge model are formulated in terms of macroscopically defined linear and nonlinear bond polarizabilities. This formulation allows the determination of the linear and nonlinear optical properties of tetrahedral solids. As a…
The recoilless resonance absorption and scattering of the 99 keV transition in 195 Pt has been studied to determine the lifetime [τ = (1.7 ± 0.2) X 10 -10 sec], conversion coefficient (α = 7.0 ± 0.3), magnetic moment (μ = —0.615 ± 0.041 nm), and radius relative to the ground state radius (δR/R < 0) of the first excite…
Abstract Partial cotton esters of long chain fatty acids of low degrees of substitution (D.S.<0.20) have been prepared by a variety of methods. In particular, the effects of the introduction of a stearoyl or an oleoyl group into the cellulose matrix on fabric properties, such as softness of hand and wrinkle recover…
The flow transients as initiated by rapid gas release are studied both experimentally and analytically. The mathematical model developed considers a multiple pin failure in a fast-reactor subassembly. In formulating the model, it is assumed that the released gas fills the subassembly cross section uniformly and that t…
Abstract Large hydrothermal deposits of halloysite clay occur in the Terraced Hills, Washoe County, Nevada and similar bodies probably are present elsewhere in the Basin and Range province. The host rock, an andesitic tuff, is underlain and overlain by volcanic flows; all these rocks are late Miocene to Pliocene in ag…
An analysis was made of the pressure distribution inside a tensioned, twisted fiber assembly. As a result of this analysis, three different expressions for the pressure, each resulting in the same average value for low twists, are obtained. Any of these expressions can be used to calculate the drafting force of a rela…
Abstract The correct figures for Fig. 1 (p. 3468) and Fig. 2 (p. 3477) are given below : FIG. 1. Elution profile of the peptic peptides of unoxidized T4 at phage lysosyme (80 mg) on a Dowex 50-×2 column (0.9 × 150 cm). Elution was carried out with a gradient of pyridine-acetate buffer established by means of a nine-ch…
The experimental conditions necessary for the resistometric detection of the pressure-induced bismuth III-IV transition are given and a value of 42·7 kilobars obtained for the start of the transition. The resistance-pressure characteristic shows the shape of the forward transition. A short discussion of recent crystal…