Poterya Viktoriya, McLain Jason L, Adams Nigel G, Babcock Lucia M
Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA.
J Phys Chem A. 2005 Aug 18;109(32):7181-6. doi: 10.1021/jp051945b.
The temperature dependencies of the rate coefficients, alpha(e), for electron-ion dissociative recombination (DR) of N2H+/N2D+ and HCO+/DCO+ ions with electrons have been measured over the range 100-500 K. Also, optical emissions have been detected at approximately 100 K from the N2(B3(pi)g) electronically excited products of N2H+/N2D+ recombination. The measurements were carried out using the classic FALP technique combined with an optical monochromator. For N2H+, there was no variation of alpha(e) with temperature above 200 K, with an average value of alpha(e)(N2H+) = 2.8 x 10(-7) cm3 s(-1). The temperature variation for T approximately 100-300 K observed for alpha(e)(HCO+) is similar to that of N2H+ ions for T approximately 300-500 K. The smaller rate coefficient measured for DCO+ and N2D+ ions shows the influence of an isotope effect. The substantial enhancement of the vibrational level, upsilon' = 6, from the N2B state for N2H+ recombination over N2D+ recombination is consistent with previous result at 300 K and implies the influence of a tunneling mechanism of DR.
已在100 - 500 K的温度范围内测量了N2H+/N2D+和HCO+/DCO+离子与电子进行电子 - 离子解离复合（DR）的速率系数α(e)对温度的依赖性。此外，还在大约100 K时检测到了N2H+/N2D+复合产生的N2(B3(π)g)电子激发产物的光发射。测量是使用经典的FALP技术结合光学单色仪进行的。对于N2H+，在200 K以上α(e)随温度没有变化，α(e)(N2H+)的平均值为2.8×10^(-7) cm³ s^(-1)。对于α(e)(HCO+)，在T约为100 - 300 K时观察到的温度变化与N2H+离子在T约为300 - 500 K时的情况相似。DCO+和N2D+离子测量得到的较小速率系数显示了同位素效应的影响。与N2D+复合相比，N2H+复合中来自N2B态的振动能级υ' = 6的显著增强与300 K时的先前结果一致，这意味着解离复合的隧穿机制的影响。
