Spin-orbit state-selected reactions of Xe+(2P3/2 and 2P1/2) with H2, D2, and HD

Spin-orbit state-selected reactions of X e + (2Pj ), j = 3/2 and 1/2, with isotopic molecular hydrogen (H2 , D2 , and HD) to form X e H + and XeD + are studied using guided ion beam mass spectrometry. Reaction cross sections are determined as a function of reactant kinetic energy from near thermal energy to 15 eV c m . Although the reaction of Xe + ( 2p 1/2 ) + H2 to form ground state products XeH+ + H is exothermic, no reaction is observed at low energies and the reaction cross section is zero or small at higher energies.