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By R. D. Cannon (Auth.)

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31) are represented by point c. 31) is possible. The most feasible reaction path suggested by the diagram is from curve C to curve A', the curve of the anti-bonding state of H 2 in H 2 + He, via the crossing point. This leads only to the separated atoms H + H++He. 6(b). 32), shown at points a and b, again correlate adiabatically with the separated-atom state (H + H + 4- Ar), and presumably they are connected to each other by a low-energy pathway. 33) represented by point c, are now at much lower energy owing to the lower ionisation energy of Ar.

As before, a transition state or long-lived intermediate leads to equal scattering of the reactants forward and backwards. 11) implies a concerted mechanism, since the products retain a 'memory' of their initial energy and direction. This is most simply explained by the 'spectator stripping' mechanism 419, 1073b . 12), it is argued that when electron transfer occurs the bond between the two Br atoms is weakened to such an extent that it is practically broken, giving a Br atom and Br " ion, but the Br atom is relatively unaffected.

The essential conditions for this argument are that the duration of the collision is negligible and that all relevant parameters other than the FC factor are equal. 19)), hence the electronic transition moments are equal. The Franck Condon factor merely determines the shape of the resulting 36 Electron transfer involving molecules vibrationally broadened absorption band, not its overall intensity. In the electron transfer process, however, we are comparing reactions of one molecule XY with two different reductants.

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