Abstract

In this work we have examined the relevance of the reactive infinite order sudden approximation (RIOSA). This was done by selecting from our previous published results only those that can be directly compared either with experiment or with results obtained from less approximate treatments (exact quantum mechanical, coupled states). In addition the quasiclassical trajectory (QCT) method represents the exact classical reference relation to which comparisons are to be made. The main findings are: (a) The RIOSA yields reliable total integral cross sections. (b) There is strong evidence that the RIOSA yields relevant integral vibrational state-to-state cross sections. (c) The situation is unclear with regard to differential cross section because very little is known about the angular distributions. So far there is some evidence that the RIOSA is able to yield angular distributions which are encountered in experiment and which the QCT method fails to do.

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