Volume 22, Issue 1
January 1984, pages 1-70
pp 1-2 January 1984
pp 3-9 January 1984 Spectroscopy
Fluorescence was excited in theB1Γu −X1Σg+ system of Na2, using the 488 and 514.5 nm radiations from a cw Ar+ laser. The fluorescence was monitored through a double monochromator employing photoelectronic detection. In the spectrum resulting from the 488 nm excitation, apart from a large number of fluorescence series, a previously unreported series could be identified. On either side of all the members of the strongest series a large number of collisional satellites were observed and assigned.
pp 11-16 January 1984 Molecular Physics
The true potential energy curves for some electronic states of CuF, CuO, CuSe and CuTe molecules have been constructed by the method of Lakshman and Rao (RKR method as modified by Lakshman and Rao). The ground-state dissociation energies evaluated by the method of curve fitting using the H-H function agree well with the values reported earlier. Ther-centroids and Franck-Condon factors for various band systems of the above diatomic molecules have been computed.
pp 17-30 January 1984 Molecular Physics
The longest wavelengthπ* ←π electronic band system of ortho-hydroxybenzonitrile vapour through the absorption technique has been reported for the first time. Assuming a planar molecular geometry in both the electronic states, the molecule is classified into aCs point group, and the present spectrum is attributed to1A′ ←1A′ type corresponding to electric dipole forbidden transition1B2u ←1A1g (260 nm band system) of benzene. The most intense band at 33914 cm−1 has been assigned as the 0, 0 band, and the other vibronic bands have been interpreted in terms of the excited state and a few ground state fundamentals.
pp 31-41 January 1984 Particle Physics
The mass spectrum of dimuons produced from the matter in the central region of rapidity in ultra-relativistic heavy-ion collisions is calculated in accordance with Bjorken’s recently proposed model for relativistic heavy-ion collisions. The matter in this central region is assumed to consist of a deconfined quark-gluon plasma phase and a pionized phase. Distinct enhancements of the dimuon mass spectrum below 500 MeV, due to the quark-gluon phase, are predicted for a deconfinement phase-transition temperatureTc<200 MeV.
pp 43-47 January 1984 Particle Physics
Dispersion theory sum rules proposed by Atkinson have been obtained for the invariant amplitudes of the elastic pion-charmed baryon scattering process. Saturating the sum rules with the known intermediate states, we obtain the pion-charmed baryon coupling constants.
pp 49-56 January 1984 Solid State Physics
Conductivity, thermally stimulated depolarisation (tsdc) and thermal studies are carried out on pure and Cu2+-doped potassium hydrogen maleate single crystals. Bothdta anddsc reveal first-order phase transition at 503 K.dsc further shows that the crystal decomposes even before the transition is complete. A ‘knee’ is observed around 505 K in conductivity plots at this transition. Thetsdc of Cu2+-doped system gave a single peak at 241 K and the reasons are analysed. Activation energies from conductivity andtsdc suggest proton conduction. However no direct evidence in coulometric experiment could be observed. But thermoelectric power measurements reveal the charge carriers to be positive.
pp 57-61 January 1984 Solid State Physics
Mössbauer studies of metallurgically prepared FeZn alloy reveal that it undergoes an irreversible phase change on heating. The new phase starts precipitating at temperatures below 403 K and causes an apparent decrease in quadrupole splitting. The results are analysed in the framework of charge shift model and it is suggested that the vibrations of iron ion in zinc are likely to be much less anisotropic than those of zinc ions in pure zinc.
pp 63-70 January 1984 Solid State Physics
Assuming a regular geometry of dispersed phase (λ2) an integrated theory for the effective thermal conductivityλe of all kind of two-phase materials (including loose materials) is developed. The flux modification is carried out by considering the effective neighbouring interactions in the solution of Poisson’s equation. A comparison of calculatedλe values with the reported experimental results over a wide range of two-phase materials shows a good agreement.
Volume 93 | Issue 5
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