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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Determination of the Rate Constants for the Radical-Radical Reactions NH_2(X~2B_1) +NH(X~3~-) and NH_2(X~2B_1) + H(~2S) at 293 K
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Determination of the Rate Constants for the Radical-Radical Reactions NH_2(X~2B_1) +NH(X~3~-) and NH_2(X~2B_1) + H(~2S) at 293 K

机译：在293 K下确定自由基NH_2（X〜2B_1）+ NH（X〜3〜-）和NH_2（X〜2B_1）+ H（〜2S）的速率常数

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摘要

The rate constant for the reactions NH2(X 2B1) + NH(X3-) and NH2(X 2B1) + H(2S) were measured over a pressure range from 2 to 10 Torr in CF4, or Ar gases at 293 ( 2 K. The radicals were produced by the 193 nm photolysis of NH3 dilute in the carrier gas. Both radicals were monitored simultaneously following the photolysis laser pulse using high-resolution time-resolved absorption spectroscopy. The NH2 radical was monitored using the 1221 r 1331 rotational transition of the (0,7,0)A 2A1 r (0,0,0) X 2B1 vibronic band near 675 nm, and the NH radical was monitored using the 1R3(4) rotational transition on the 1-0 vibrational transition near 3084 nm. The data was analyzed using model simulations of the NH2 and NH temporal concentration profiles. The rate constants for the NH2 + NH and NH2 + H reactions were found to be (9.6 ( 3.2) 10-11 and (7.7 ( 14) 10-15 cm3 molecule-1 s-1, respectively, where the uncertainty includes an estimate of both systematic and random errors. The measurements were independent of the nature of the diluents, CF4 or Ar, and total pressure.
机译：在CF4压力范围2至10 Torr或293（2 K K）的Ar气体中测量NH2（X 2B1）+ NH（X3-）和NH2（X 2B1）+ H（2S）反应的速率常数自由基是由载气中NH3稀释液在193 nm处的光解产生的，光解激光脉冲后同时使用高分辨率时间分辨吸收光谱法同时监测两个自由基，并使用1221 r 1331旋转跃迁监测NH2自由基。 （0,7,0）A 2A1 r（0,0,0）X 2B1振动带在675 nm附近的位置，使用1R3（4）旋转跃迁在3084附近的1-0振动跃迁上监测NH自由基使用NH2和NH时间浓度分布的模型模拟分析数据，发现NH2 + NH和NH2 + H反应的速率常数为（9.6（3.2）10-11和（7.7（14）10 -15 cm3分子-1 s-1，其不确定性包括系统误差和随机误差的估计。与稀释剂CF4或Ar的性质以及总压力无关。

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