Reactions of HBr+ ions in the 2Π i , v + quantum states with H2 and HBr molecules

Abstract

The mechanisms and kinetics of low-temperature ion-molecular reactions between the Br+, HBr+, and DBr+ions and the HBr, DBr, H2, and D2 molecules were studied. The HBr+ (i,v+) and DBr+(i,v+) ions were prepared in separate spin-orbit (i) and vibrational (v+) states by resonance multiphoton ionization in a free flow of halogen halides (HBr and/or DBr) with hydrogen, deuterium, or inert gases (Ar, He). The effectiveness of various reaction channels, including the exchange of charges, H and D atoms, and H+andD+ ions, was studied. The quantitative data on the kinetics of these reactions were obtained for separate quantum states of the ions. The resonance ionization of one of the two ion isotopomers H79Br+(D79Br+) or H81Br+(D81Br+) was used to study and compare the effectiveness of various ion-molecular reaction channels.