Fp. Capetanakis et al., TEMPERATURE-DEPENDENCE OF THE QUENCHING OF O(S-1) BY SIMPLE INORGANICMOLECULES, The Journal of chemical physics, 98(10), 1993, pp. 7883-7887
The quenching of metastable O(1S) atoms by H-2, O2, CO, CO2, N2O, and
SF6 was studied in the temperature range 210-470 K. Very low concentra
tions of O(1S) atoms were generated in the pulsed vacuum ultraviolet (
VUV) L(alpha) photolyses of N2O and CO2. The atoms were detected by th
eir forbidden emission at around 557.7 nm, the intensity of which was
enhanced by the formation of exciplexes in the presence of Ar. The que
nching by H-2 and SF6 is very inefficient and occurs without a signifi
cant activation energy. The rate constants for the quenching by CO and
CO2 can be represented by activation energies near 1 0 kJ mol - 1 but
very different frequency factors. The collisions of O(1S) with O2 and
N2O lead to different products which likely are formed with different
activation energies. It is proposed that generally quenching of O(1S)
proceeds by diabatic processes.