Measurement of the probability of heterogeneous deactivation of CO2(00 degrees 1) and CO2(00 degrees 2) molecules on Ni electrodes

Vibrational deactivation of the antisymmetric mode of carbon dioxide in gas phase and at a Ni cathode with the surface temperature of approximately 40 0 K is studied in a discharge in CO2 under "hollow cathode" conditions. The proposed kinetic model faithfully reproduces the relationship between the frequency of pulses sustaining the discharge, which is measured by the radi ation intensity, and the total probability of deactivation of vibrational s tates in discharge afterglow. The probabilities of the surface deactivation of CO2(00(0)1) and CO2(00(0)2) are estimated at gamma(1)=0.012+/-0.005 and gamma(2)=0.010+/-0.002, assuming that deactivation is a first-order hetero geneous process. The rate constant for CO2(00(0)2) deactivation by CO2(00(0 )0) molecules is estimated at kCO(2) = (4.0+/-0.3) . 10(-15) cm(-3) . s(-1) .