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Franck--Condon factors and r-centroids have been computed for 18 bands of Dll-I--XI~ transition of SnO molecule, using the realistic RKR potentials. The electronic transition moment variation with internuclear distante has been evaluated and this is represented byFranck--Condon factors and r-centroids of DUBE and RAI on Morse potential model are erroneous and hence fresh Morse calculations have been carried out. Also the vibrational temperature has been computed, both under constancy of electronie transition moment and under its variation. Allied parameters like oscillator strengths, Einstein coefficients etc. have been computed.

The orientational relaxation times ( T ) of coumarin 102 and coumarin 138 molecules were measured in ethanol and ethylene glycol solutions at room temperature by transient dichroism technique on picosecond time scales. The experimental data were compared with the calculated values based on Stokes-Einstein-Debye (SED) hydrodynamic model. The results show that the measured values o f 7 o f both the dyes in ethanol reasonally agree with the theoretical ones; but for ethylene glycol solutions, relaxation times are shortened indicating the inadequacy o f the !ZED model for the description o f the rotational motions. The results are r r 153 Copyright 0 1995 by Marcel Dekker, Inc Downloaded by [The University of Manchester Library] at 17:31 22 December 2014 154 CHANDRASEKHAR ET AL. discussed on the basis of molecular structures of the dyes and intermolecular interactions.

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Two approximation methods for solving the SchrSdinger equation, one recently proposed by H~.nMXN et al., called the iteration method and the other due to LXNG•n, have been compared computing wave funetions by these methods for (A-X) transition of AIO and using them to compute Franck--Condon faetors. RKR (Rydberg-Klein-Rees) Franek-Condon factors have been taken as standard results for eomparison. It is found that the iteration method is better than LXN6~n's. Compared to RKR procedure, the iteration method is also much simpler.