活性氮与碘乙烷反应化学发光研究

Chemiluminescence Studies on Iodoethane Reaction with Active Nitrogen

在流动余辉装置上,利用N2空心阴极放电制备活性氮,研究了活性氮与碘乙烷(C2H5I)反应的化学发光.在620～820nm波长范围内观察到了较强的发射光谱,拟合得到的光谱常数表明它来源于NI(b1Σ+→X3Σ-)跃迁,并对35个谱峰进行了振动归属.最后讨论了活性氮中主要成分与C2H5I反应的可能过程,结合辅助性实验分析表明,活性氮中的N(2P)与C2H5I直接反应很可能产生激发态NI(b1Σ+)自由基.这是利用化学反应直接产生激发态NI(b1Σ+)的首次报道,观察到的激发态最高振动能级为v'=6.

Active nitrogen has been prepared by the hollow-cathode discharge through N2 in a flowing afterglow reactor. Strong emission spectra in the wavelength of 620-820 nm were detected when iodoethane （C2H5I） was added to a stream of active nitrogen, and the 35 spectral peaks have been assigned to the vibrational transitions of the NI（b^1∑^＋→X^3∑^-） band system. The possible formation mechanism of the electronically excited NI（b^1∑^＋） was proposed to be the reaction of N（^2p） in active nitrogen with C2H5I based on some quenching experiments. This is the first experimental evidence about the excited NI（b^1∑^＋） generation through chemical reaction in gas phase, and the highest vibrational level detected is v＇= 6.