CO(v,J) product state distributions from the reaction O(3P) + OCS --> CO + SO

Scott L. Nickolaisen; Harry E. Cartland; David Veney; Curt Wittig

doi:10.1117/12.58159

1 April 1992 CO(v,J) product-state distributions from the reaction O(³P) + OCS --> CO + SO

Scott L. Nickolaisen, Harry E. Cartland, David Veney, Curt Wittig

Proceedings Volume 1638, Optical Methods for Time- and State-Resolved Chemistry; (1992) https://doi.org/10.1117/12.58159
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

The title reaction was studied by probing the CO(v,J) product state distributions. Oxygen atoms were formed by 355 nm photolysis of NO₂. Photolysis produces approximately equal populations of NO(v equals 0) and NO(v equals 1). The collision energy of oxygen atoms corresponding to NO(v equals 0) is 1570 cm^-1. This is above the O + OCS activation barrier of 1540 cm^-1. Oxygen atoms corresponding to NO(v equals 1) do not have sufficient energy to proceed over the activation barrier, thus insuring monoenergetic collisions. CO product was probed using an IR tunable diode laser. Nascent CO distributions were extracted from the transient absorption signals using an initial slope approximation. A vibrational branching ratio of [v equals 1]/[v equals 0] = 2) was not detected. The CO(v equals 0) rotational Boltzmann plot was bimodal. The distribution for 0 = 15, the plot had a temperature of 4400 +/- 390 K. The low J population is the result of rotational relaxation of the nascent CO distribution. The high J signals are direct measure of the nascent CO population. Surprisal analysis resulted in a parameter of (Theta) _R equals 3.7 +/- 0.5. Hence, the CO(v equals 0) distribution is colder than a `prior' statistical model.

Citation Download Citation

Scott L. Nickolaisen, Harry E. Cartland, David Veney, and Curt Wittig "CO(v,J) product-state distributions from the reaction O(³P) + OCS --> CO + SO", Proc. SPIE 1638, Optical Methods for Time- and State-Resolved Chemistry, (1 April 1992); https://doi.org/10.1117/12.58159

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