Temperature dependence and deuterium kinetic isotope effects in the HCO + NO reaction.
The reactions of HCO and DCO with NO have been measured by the laser photolysis/continuous-wave (CW) laser-induced fluorescence (LIF) method from 296 to 623 K, probing the ({tilde B}{sup 2}A{prime} {l_arrow} {tilde X}{sup 2}A{prime}) HCO (DCO) system. The HCO + NO rate coefficient is (1.81 {+-} 0.10) x 10{sup -11} cm{sup 3} molecule{sup -1} s{sup -1} and the DCO + NO rate coefficient is (1.61 {+-} 0.12) x 10{sup -11} cm{sup 3} molecule{sup -1} s{sup -1} at 296 K. Both rate coefficients decrease with increasing temperature between 296 and 623 K. The kinetic isotope effect is k{sub H}/k{sub D} = 1.12 {+-} 0.09 at 296 K and increases to 1.25 {+-} 0.15 at 623 K. The normal kinetic isotope effect supports abstraction as the principal mechanism for the reaction, in agreement with recent computational results.
- Research Organization:
- Sandia National Laboratories
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 972494
- Report Number(s):
- SAND2005-4179J
- Journal Information:
- Proposed for publication in the Journal of Photochemistry and Photobiology A : Chemistry., Journal Name: Proposed for publication in the Journal of Photochemistry and Photobiology A : Chemistry.
- Country of Publication:
- United States
- Language:
- English
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