Intensities and line shapes in the v2-fundamentals of 14NH3 and 15NH3

Spectral transmission measurements in the v^s₂- and v^a₂-fundamentals of ¹⁴NH₃ and ¹⁵NH₃ have yielded information that is valuable in the interpretation of spectroscopic scans of Jupiter covering the thermal infrared between 9 and 12 μm. Our experimental data demonstrate that the absorption spectra of the two species of NH₃ differ from each other only in line positions but not in the strengths, widths or shapes of lines with the same quantum number designations.     

Ruthenium(III), osmium(VIII) and ruthenium(III) + osmium(VIII) catalysed oxidations ofi-propanol by N-bromosuccinimide in basic solution

Summary The oxidation ofi-propanol (IPA) by N-bromosuccinimide (NBS) in basic solution was investigated separately in the presence of Ru^III, Os^VIII and Ru^III + Os^VIII ions. The order in [IPA] was found to be 0.7, 0.5 and 0.3 respectively in the above three cases in the concentration range studied. The order in [NBS] was unity in the presence of Ru^III chloride but was found to be zero in the case of Os^VIII and Ru^III+Os^VIII catalysis. The order in [metalion] was found to be nearly unity in all the three catalysed reactions. Increase in [^–OH] increased the rate of reaction while addition of succinimide retarded the rate of reaction. Decrease in dielectric constantsof the medium decreased the rate of oxidation. The pseudo first order rate constants (k), zero order rate constants (k₀) and the formation constants (k_f) of the substrate-catalyst complexes and the thermodynamic parameters have been evaluated. Suitable mechanisms in conformity with the experimental observations have been proposed for the three catalysed reactions.     

Electronic states in early-late transition metal glasses: Application to Cu0.60Zr0.40

The electronic properties of amorphous Cu_0.60Zr_0.40 are studied within the two component muffin-tin EMA framework. We argue that an understanding of the photoemission spectrum of this system requires that short range order effects be incorporated in both the construction of the atomic potentials and the calculation of the average spectrum. However, we show that the essential features of the density of states can be understood on the basis of simpler calculations in which the glass is modeled as either a substitutional alloy or a liquid with just a single pair distribution function.     

Collision-broadened line widths of tetrahedral molecules—I. Theoretical formulation

A theoretical formulation is presented within the framework of Anderson-Tsao- Curnutte theory for calculating the half-widths of spectral lines belonging to tetrahedral molecules. The importance of tetrahedral symmetry in the change distribution and in the wave functions is emphasized. Expressions for the interruption functions S₂(b) have been derived for octopole-dipole, octopole-quadrupole, octopole-octopole, octopole-hexadecapole, hexadecapole- hexadecapole, anistropic dispersion interactions as well as for an assumed overlap interaction potential. The earlier theoretical work of Tejawni and Yamamoto and Hirono is shown to be inappropriate for molecules of tetrahedral symmetry.