Temperature dependence and deuterium kinetic isotope effects in the HCO plus NO reaction

被引：1
|
作者：
DeSain, JD [1 ]
Jusinski, LE [1 ]
Taatjes, CA [1 ]
机构：
[1] Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA
来源：
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2005年 / 176卷 / 1-3期
关键词：
chemical kinetics; HCO; combustion chemistry;
D O I：
10.1016/j.jphotochem.2005.07.023
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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 623K, probing the ((B) over tilde (2) A' <- (X) over tilde (2) A') HCO (DCO) system. The HCO +NO rate coefficient is (1.81 +/- 0.10) x 10(-11) cm(3) molecule(-1) s(-1) and the DCO +NO rate coefficient is (1.61 +/- 0.12) x 10(-11) cm(3) molecule(-1) s(-1) at 296K. Both rate coefficients decrease with increasing temperature between 296 and 623 K. The kinetic isotope effect is k(H)/k(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. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：149 / 154
页数：6
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