Fine-structure state-dependent reactivity of Kr+(2Pj) with O2, CO, N2O and OCS from 0.04 to several eV collision energy

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Abstract
The separate reactions of the 2P3/2 and 2P1/2 ground states of Kr+ with O2, CO, N2O and OCS have been investigated over the mean relative kinetic energy (Ecm) range from 0.04 to several eV using a flow-drift tube (FDT) apparatus. The versatility of the technique has permitted state selective ion generation and depletion. Charge transfer has been observed from Kr+(2P3/2) and Kr+(2P1/2) to each neutral reactant with rate coefficients k and k* respectively. Although not previously observed at 300K, collisional Kr+(2P1/2) to Kr+(2P3/2) conversion (quenching) with the neutral reactant is taken into account, since this process can become significant at higher energies, as is demonstrated here in reactions with N2O. This is described by a rate coefficient kq. Experiments with CO suggested the reverse process of collisional conversion Kr+(2P3/2) to Kr+(2P1/2) also takes place above the necessary energy threshold. Experimental result (for the reactants shown) are presented for k(O2, N2O and OCS), k* (OCS) and kt (N2O, O2 and OCS, where k*fq) over the accessible Ecm range.