O2(b1Σg +) Removal by H2, CO, N2O, CH4, and C2H4 in the 300–800 K Temperature Range

Rate constants for the removal of O2 b1Σg + by collisions with species relevant to combustion, H2, CO, N2O, CH4 and C2H4 have been measured in the temperature range 297–800 K. O2(b1Σg +) was produced from ground-state molecular oxygen by photoexcitation pulses from a tunable dye laser, and the deactivation kinetics were followed by observing the temporal behavior of the b1Σg +–X3Σg – fluorescence. The removal rate constants for H2, CO, N2O, CH4, and C2H4 could be represented by the modified Arrhenius expressions k H2 = (1.44 ± 0.02) × 10–16 T 1.5 exp­[(0 ± 10)/T], k CO = (6.9 ± 0.4) × 10–24 T 3 exp­[(939 ± 33)/T], k N2O = (2.63 ± 0.14) × 10–18 T 1.5 exp­[(590 ± 26)/T], k CH4 = (3.5 ± 0.2) × 10–17 T 1.5 exp­[(−220 ± 24)/T], and k C2H4 = (2.34 ± 0.10) × 10–20 T 2.5 exp­[(680 ± 16)/T] cm3 molecule–1 s–1, respectively. All of the rate constants measured at room temperature were found to be in good agreement with previously reported values, whereas the values at elevated temperatures up to 800 K were systematically measured for the first time.