Mobilities and interaction potentials for Br−–Ar, Br−–Kr, and Br−–Xe

Abstract

Interaction potentials for Br(2 P)+Ar, Kr, and Xe (1 S) by the crossed molecular beams method Mobilities ofBr-ions in Ar, Kr, and Xe gases at 300 K have been measured in a drift tube mass spectrometer over a wide range of E/N (the ratio of the electric field to the neutral gas number density). For any ion-neutral gas interaction potential, implementation of the Viehland-Mason kinetic theory (accurate for arbitrary E/N) yields theoretical mobility data. This theory is employed in conjunction with an iterativeinversion scheme which uses experimental mobility data to modify an initial "guess" 4,6,12 potential to produce a "directly determined" potential which accurately reproduces the experimental mobilities for a given ion-neutral atom pair. These potentials are tabulated for Be -Ar, Br--Kr, and Br--Xe and their salient features are compared to previous "directly derived" potentials of other ions in these gases.