Temerature- and species-dependent quenching of CO B probed by two-photon laser-induced fluorescence using a picosecond laser

摘要

We report measurements of the temperature- and species-dependent cross sections for the quenching of fluorescence from the B~1(sum)~+ (v = 0) state of CO. Cross sections were measured for gas temperatures ranging from 293 K to 1031 K for quenching by H_2, N_2, O_2, CO, H_2O, CO_2, CH_4, He, Ne, Ar, Kr, and Xe. The CO B~1(sum)~+(v = 0) state was populated via two-photon excitation B~1(sum)~+ implied by implied by X~1(sum)~+), and the B~1(sum)~+ -> A ~1#PI# fluorescence-decay rate on quencher-gas pressure. The temperature dependence of the cross sections is well described by a power law for all but the two weakest quenchers, He and Ne.