Abstract
The formation and decay kinetics of HCO(0, 0, 0) and vibrationally excited HCO were measured following the 266 nm photolysis of acetaldehyde (CH 3CHO) vapor. Time-resolved intracavity laser spectroscopy was used to detect the absorption of HCO with 1–2 μs time resolution. The kinetic properties of HCO were modeled using simulations derived from measured kinetic parameters and from best-fit comparisons. The two components observed in the formation of HCO(0, 0, 0) were identified with its production by direct photolysis and by intermolecular energy transfer from vibrationally excited HCO (second-order rate coefficient k = (1.1 ± 0.3) × 10 −11 molecule −1 cm 3 s −1 for acetaldehyde collisions). Contributions from rotationally excited HCO were not observed.
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