期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 122, 期 15, 页码 3735-3746出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.8b01512
关键词
-
资金
- Russian Foundation for Basic Research [16-05-00432]
Reactions of OH and OD radicals with NH2CHO and ND2CHO were studied by Fourier transform infrared emission spectroscopy of the product molecules from a fast-flow reactor at 298 K. Vibrational distributions of the HOD and H2O molecules from the primary reactions with the C - H bond were obtained by computer simulation of the emission spectra. The vibrational distributions resemble those for other direct H atom absraction reactions, such as with acetaldehyde. The hihest observed level gives an estimate of the C H bond dissociation, energy in formamide of 90.5 +/- 1.3 kcal mo1(-1). Observation of CO2, ammonia, and secondary water chemiluminescence gave evidence that recombination of OH and NH2CO forms carbamic acid (NH2COOH) with excitation energy of 103 kcal mol(-1), which decomposes through two pathways forming either NH3 + CO, or H2O + HNCO. The branching fraction for ammonia formation was estimated to be 2-3 times larger than formation of water. This observation was confirmed by RRKM calculation of the decomposition rate constants. A new simulation method was developed to analyze infrared emission from NH3, NH2D, ND2H, and ND3. Dynamical aspects of the primary and secondary reactions are discussed based on the vibrational distributions of CO, and those of H/D isotopes of water and ammonia.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据