Single-vibronic level rate constant

For the case in which the electronic transition is much faster than vibrational relaxation, one has to use the single-vibronic level rate constant and in analyzing the transient absorption or stimulated emission spectra, the single-vibronic level absorption or stimulated emission coefficient should be used. For... 

Only the single-vibronic-level rate constants for the displaced surfaces will be given in the following a more general case is presented in Appendix A. Notice that using the integral representation for the Lorentzian and... 

There are three types of rate constants appearing in the previous subsection, i.e., WbUiav, the state-to-state rate constant, Wav (or Wbu), the single-vibronic level rate constant, and Wa b (or Wb a), the thermal average rate constant. In the BOA approximation,... 

Single-Vibronic-Level and Thermal Average Rate Constant. 142... 

In the above discussion the single-vibronic-level and thermal average rate constants have only been calculated using the displaced oscillator surfaces. 

SOM HaS Reactions.—The photolysis of SOa in Ha at 147 nm and 116—123.6 nm has been studied,388 and emission from OH(/f - X), S ( -> X), and SO(B -+ X) was observed in addition to SOa fluorescence. The quantum yield of S03 formation was found to be <0.4 at 123.6 nm. A fuller paper has appeared on single vibronic level fluorescence from the state of SOa vapour. This confirms that there are two different groups of rovibronic states, one of which is very long-lived (80—600 (is), the other being short ( 50 (jis) and with a bimolecular quenching rate-constant that is an order of magnitude greater than the gas-kinetic rate.388 The extensive implications of this important observation were discussed in Volume 5,887 and will not be repeated here. 

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