Spin-orbit state-selected reactions of Kr+(2P3/2 and 2P1/2) with H2, D2, and HD from thermal energies to 20 eV c.m.

Spin-orbit state-selected reactions of K r + (2Pj), J = 3/2 and / = 1/2, with isotopic molecular hydrogen (H2 , D2 , and HD) to form KrH+ and Kr D+ are investigated using guided ion beam techniques. Reaction cross sections for each spin-orbit state are measured as a function of the relative translational energy of the reactants from near thermal energies up to 20 eV cm. At low energies, the cross sections for reaction with H2 and D 2 are each about 2.6 times larger for the 2P3/2 ground spin-orbit state of krypton ion than for the 2Px12 excited state.