Phonon dispersion relations in copper

Phonon frequencies for copper have been obtained by extending the work of Yuenand Varshni to include the electron-ion interaction term of de Launay's model. The results thus obtained show a better agreement with the experimental data.     

Evidence for single electron transfer in the reduction of alcoholswith lithium aluminum hydride

EPR evidence supporting a single electron transfer mechanism in the reduction of secondary and tertiary alcohols to hydrocarbons with LiAlH₄ is presented.     

Nonnegative mth roots of nonnegative 0-symmetric idempotent matrices

Nonnegative mth roots of nonnegative 0-symmetric idempotent matrices have been characterized. As an application, a characterization of nonnegative matrices A whose Moore-Penrose generalized inverse A² is some power of A is obtained, thus yielding some well-known theorems.     

Experimental study of the variation of the plasma temperature with the laser flux

Experiments performed with a 50 MW — 60 nsec ruby laser to estimate the temperature of the plasma produced on the planar targets of carbon as well as polyethylene are reported. Temperatures were estimated by two foil ratio technique. The temperatures of carbon and polyethylene plasma show aφ ^2/9 dependance on flux in the flux regime of 10¹⁰ W/cm² to 5 × 10¹¹ W/cm². The comparatively slower dependance is explained on the basis of purely collisional absorption, the effect being enhanced due to relatively long duration of the laser pulses. Scaling laws of plasma temperature against laser flux obtained by different workers in different flux regimes have been analysed on the basis of collisional and non-collisional absorption.     

Electroproduction of η mesons in the region of the resonances S11(1535)

We report on an experiment on electroproduction in the resonance region in the mass range 1505 ? W ? 1715 MeV. Data have been taken at q² = 0. 22, 0.6 and 1 GeV². The angular distributions obtained support that η production proceeds mainly through S-wave excitation due to the resonance S₁₁(1535).The total cross section of the formation of this resonance decreases much more slowly with increasing momentum transfer than the total ep cross section.     

Iron (III) complexation with 2,3-pyridinediol

Iron(III) complexation with 2,3-pyridinediol has been investigated with a view to ascertaining the structures of the complexes formed and examining the analytical potential of this biochemically important ligand.