Vibrational energy transfer in CO from 100 to 300 deg;K

摘要

The laser fluorescence method, whereby CO molecules are optically pumped from the vibrational levelvequals;0 to thevequals;1 state by frequencyhyphen;doubled pulses from a CO2laser, has been used to determine vibrational energy transfer rate coefficients for CO. Rates for theVhyphen;Vexchange processes CO(0)plus;N2(1)rarr;CO(1)plus;N2(0) and CO(1)plus;CO(1) rarr;CO(0)plus;CO(2), and for the deactivation of CO(1) by H2have been measured in the range 100deg;K le;Tle; 300deg;K. The probability of energy transfer from N2to CO decreases slightly asTdecreases in this range, while the probability of the COsngbnd;COVhyphen;Vprocess is approximately proportional toTminus;1. Rate coefficients were also measured atTequals;297deg;K for the deactivation of CO(1) by the polyatomic molecules CH4, C2H4, C2H6, HCOOH, CH3COOH, CH3CHO, CH3OH, C2H5OH, H2O, D2O, H2S, and C4H10.