Ra. Brownsword et al., ABSOLUTE REACTIVE CROSS-SECTION FOR H-ATOM FORMATION IN THE REACTION OF TRANSLATIONALLY ENERGETIC O(D-1) ATOMS WITH METHANE, The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, 102(24), 1998, pp. 4438-4443
The dynamics of the H atom formation channel in the reaction of metast
able oxygen atoms O(D-1) with methane were studied in the gas phase us
ing the pulsed laser photolysis/vacuum-UV laser-induced fluorescence '
'pump-and-probe'' technique. Translationally energetic O(D-1) atoms wi
th an average collision energy of 37 kJ/mol in the O(D-1)-CH4 center-o
f-mass system were generated by laser photolysis of N2O at 193 nm. Nas
cent H atoms produced in reactive collisions of O(D-1) with room-tempe
rature CH4 molecules were detected with sub-Doppler resolution via (2p
(2)P - 1s(2)S) laser-induced fluorescence. An absolute reaction cross
section of sigma(H)(37 kJ/mol) = 1.4 +/- 0.5 Angstrom(2) was determine
d for the H atom formation channel by means of a calibration method. F
rom the Il atom Doppler profiles measured under single-collision condi
tions the product translational energy release was determined.