Kinetic study of the reaction of hydroxyl with hydrogen and deuterium from 250 to 1050 K

Kinetic study of the reaction of hydroxyl with hydrogen and deuterium from 250 to 1050 K
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250 至 1050 K 羟基与氢和氘反应的动力学研究

DOI:
10.1021/j150617a018
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发表时间:
1981
期刊:
The Journal of Physical Chemistry
影响因子:
--
通讯作者:
F. P. Tully
F. P. Tully
中科院分区:
--
文献类型:
--
作者:
A. Ravishankara;J. Nicovich;R. Thompson;F. P. Tully

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反应OH + H/sub 2/…->…的绝对速率系数H /订阅2 / O + H (k /子1 /)和哦+ D /子2 /…- >…在250 ~ 1050/sup 0/ k范围内,用闪光光解-共振荧光技术测定了DHO + D (k/sub 2/)。介绍了闪光光解-共振荧光技术在高温研究中的应用。k/sub 1/和k/sub 2/的测量值表现出非阿伦尼乌斯行为。k/sub 1/和k/sub 2/最好用三参数函数来描述,k/sub 1/(T) = (4.12 x 10/sup -19/)T/sup 2/ /sup 44/ exp(-1281/T) cm/sup 3/分子/sup -1/ s/sup -1/和k/sub 2/(T) = (4.37 x 10/sup -15/)T/sup 1/ /sup 18/ exp(-2332/T) cm/sup 3/分子/sup -1/ s/sup -1/在整个温度范围250至1050/sup 0/ k。或者,在低温下,k/sub 1/和k/sub 2/可以用Arrhenius表达式来描述,k/sub 1/(T) = (4.9 +- 0.5) × 10/sup -12/ exp(-(1.99 +- 0.34) × 10/sup 3//T) cm/sup 3/分子/sup -1/ s/sup -1/ 250 < T < 470/sup 0/ k, k/sub 2/(T) = 1.21 +- 0.52) × 10/sup -11/ exp(-(2.67 +- 0.15) × 10/sup 3//T) cm/sup 3/分子/sup -1/ s/sup -1/ 250 < T < 470/sup 0/ k。结果与基于反应1从头算势能面的理论计算结果进行了比较。«少
Absolute rate coefficients for the reactions OH + H/sub 2/ ..-->.. H/sub 2/O + H (k/sub 1/) and OH + D/sub 2/ ..-->.. DHO + D (k/sub 2/) have been measured between 250 and 1050/sup 0/K by using the flash photolysis-resonance fluorescence technique. The adaptation of the flash photolysis-resonance fluorescence technique to high-temperature studies is described. The measured values of k/sub 1/ and k/sub 2/ exhibit non-Arrhenius behavior. k/sub 1/ and k/sub 2/ are best described by three-parameter functions, k/sub 1/(T) = (4.12 x 10/sup -19/)T/sup 2/ /sup 44/ exp(-1281/T) cm/sup 3/ molecule/sup -1/ s/sup -1/ and k/sub 2/(T) = (4.37 x 10/sup -15/)T/sup 1/ /sup 18/ exp(-2332/T) cm/sup 3/ molecule/sup -1/ s/sup -1/ over the entire temperature range 250 to 1050/sup 0/K. Alternatively, at low temperatures k/sub 1/ and k/sub 2/ can be described by Arrhenius expressions, k/sub 1/(T) = (4.9 +- 0.5) x 10/sup -12/ exp(-(1.99 +- 0.34) x 10/sup 3//T) cm/sup 3/ molecule/sup -1/ s/sup -1/ for 250 < T < 400/sup 0/K and k/sub 2/(T) = 1.21 +- 0.52) x 10/sup -11/ exp(-(2.67 +- 0.15) x 10/sup 3//T) cm/sup 3/ molecule/sup -1/ s/sup -1/ for 250 < T < 470/sup 0/K. The results are compared withmore » theoretical calculations based on an ab initio potential energy surface for reaction 1.« less