Vibrational Predissociation of the He - I2 (B, v = 34) - Ne Complex: Sequential Mechanism and Direct Dissociation
The competition between direct dissociation of He — I 2 — Ne, producing either a diatomic fragment He — Ne or separated rare atoms plus I2 and sequential processes in which a rare atom and a triatomic complex emerge in a first step, is estimated by means of quantal approximations resting on the Fermi’s Golden Rule. Assuming a non rotating I2 molecule and restricting the rare atoms to move on a perpendicular plane to its axis, the four-body problem is reduced to an effective three-body one after a diabatic separation of the iodine vibration is performed. Bond coordinates are used to describe sequential mechanisms as well as double continuum fragmentation, while Jacobi coordinates appear as more convenient to analyse the dissociation into two diatomic, 12 and He — Ne,fragments.
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