EXCITED STATE KINETICS IN HIGH PRESSURE GAS MIXTURES OF ARGON AND XENON

[摘要] The time dependence of Ar('+)Xe (--->) ArXe('+) + hv(328nm) heteronuclear ion emission in Ar-Xe mixtures was measured following pulsed excitation by a low intensity, high energy electron beam. The time dependence was obtained at pressures of 120 to 3500 Torr and at temperatures ranging from 0 to 80 degrees C. The population of the upper ionic state of the transition is found to be governed by a dissociation-recombination reaction and is strongly quenched by formation of an unknown triatomic molecular ion of Ar and Xe. The measured dissociation, recombination, and quenching rate constants for Ar('+)Xe are (1 (+OR-) 0.3) x 10('-12) cm('3)/sec, (1.5 (+OR-) 0.5) x 10('-31) cm('6)/sec, and (5 (+OR-) 0.8) x 10('-31) cm('6)/sec, respectively. The radiative lifetime was determined to be 200 ns. Least squares fitting of the temperature dependent data yields an apparent activation energy of (TURN)0.14 eV.

[发布机构] Rice University

[效力级别] physics