| Abstrakt: |
Rate constants for the removal of O2b1Σg+by collisions with species relevant to combustion, H2, CO, N2O, CH4and C2H4have 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 C2H4could be represented by the modified Arrhenius expressions kH2= (1.44 ± 0.02) × 10–16T1.5exp[(0 ± 10)/T], kCO= (6.9 ± 0.4) × 10–24T3exp[(939 ± 33)/T], kN2O= (2.63 ± 0.14) × 10–18T1.5exp[(590 ± 26)/T], kCH4= (3.5 ± 0.2) × 10–17T1.5exp[(−220 ± 24)/T], and kC2H4= (2.34 ± 0.10) × 10–20T2.5exp[(680 ± 16)/T] cm3molecule–1s–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. |
