Charge transfer half-collisions: Photodissociation of the Kr⋅O+2 cluster ion with resolution of the O2 product vibrational states

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Abstract
The photodissociation of the Kr⋅O+2 cluster ion has been studied in the visible and UV regions of the spectrum (350–580 nm) using a crossed high energy ion beam/laser beam experiment. Photodissociation of Kr⋅O+2 occurs by a charge transfer transition to Kr+⋅O2 state(s). The only ionic product observed was Kr+. A value for the dissociation energy of the Kr⋅O+2 cluster of D00(Kr–O+2) ∼0.33 eV was estimated from the results. A compilation of ion–molecule cluster dissociation energies is given. The product angular distributions indicate that the lifetime of the excited state(s) is less than a rotational period. In the visible region of the spectrum the products are Kr+(2P3/2)+O2(2Σ−). For the UV it is argued that one of the products is probably electronically excited [i.e., either Kr+(2P1/2) or O2(1Δg)]. The product relative kinetic energy distributions show resolved features that can be assigned to production of the product O2 in specific vibrational states. Information on the product rotational excitation was also derived from these results. The potential surfaces of the [Kr⋅O2]+ system are discussed along with literature data on the charge transfer reaction between Kr+ and O2.