O(bΣ) Removal by H, CO, NO, CH, and CH in the 300-800 K Temperature Range.

Rate constants for the removal of O bΣ by collisions with species relevant to combustion, H, CO, NO, CH and CH have been measured in the temperature range 297-800 K. O(bΣ) 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 bΣ-XΣ fluorescence. The removal rate constants for H, CO, NO, CH, and CH could be represented by the modified Arrhenius expressions k = (1.

O(bΣ) Quenching by O, CO, HO, and N at Temperatures of 300-800 K.

Rate constants for the removal of O(bΣ) by collisions with O, N, CO, and HO have been determined over the temperature range from 297 to 800 K. O(bΣ) was excited by pulses from a tunable dye laser, and the deactivation kinetics were followed by observing the temporal behavior of the bΣ-XΣ fluorescence. The removal rate constants for CO, N, and HO were not strongly dependent on temperature and could be represented by the expressions k = (1.

Dissociation of molecular iodine in a flow tube in the presence of O2(1Σ) molecules.

Molecular iodine dissociates in the presence of O(2)((1)Δ) and O(2)((1)Σ) molecules, but the mechanism of this process is not completely understood. In this paper, using flow tube experiments, we studied the initiation stage of iodine dissociation. Absolute spectral irradiance measurements were employed for measurements of concentrations of electronically excited particles.