Transition from complex to stripping

The endothermic reaction (95) has been found to have a threshold energy of 0.2 eV (CM). Complex formation at energies slightly above the threshold and stripping at higher energies have been recognized. At around 4 eV (CM), two peaks were observed in the velocity spectrum of the product, as in the reaction CD4 + CD4 described above. A characteristic 

It is seen that F, generally increases with increasing iV and approaches a limiting value of about 3 eV for systems consisting of many atoms. The values of E J are scattered over two orders of magnitude at small values of N, indicating that the dynamics is not determined only by N. 

Although the complex formation is not a problem of interaction time only, we can readily calculate minimum interaction times necessary for complex formation from the measured values of F,r. For instance. Ding et al. [147] find that for reaction (95) the transition occurs at impact energies of about 40 eV which corresponds to an ion velocity of about 

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