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The electronic states and the spin-orbit couplings between them involved in the photodissociation process of the radical molecules CH 3 X, CH 3 X → CH 3 + X (X = O, S), taking place after the Ã( 2 A 1 ) ← X[combining tilde]( 2 E) transition, have been investigated using highly correlated ab initio techniques. A two-dimensional representation of both the potential-energy surfaces (PESs) and the couplings is generated. This description includes the C-X dissociative mode and the CH 3 umbrella mode. Spin-orbit effects are found to play a relevant role in the shape of the excited state potential-energy surfaces, particularly in the CH 3 S case where the spin-orbit couplings are more than twice more intense than in CH 3 O. The potential surfaces and couplings reported here for the present set of electronic states allow for the first complete description of the above photodissociation process. The different photodissociation mechanisms are analyzed and discussed in light of the results obtained.

Photodissociation of the CH3O and CH3S radical molecules: an ab initio electronic structure study

Photodissociation of the CH₃O and CH₃S radical molecules: an ab initio electronic structure study