摘要
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.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2006年第16期1673-1675,共3页
Acta Chimica Sinica
基金
国家自然科学基金(No.20577049)
合肥物质研究院院长基金
安徽省优秀青年科技基金(No.06045098)资助项目.
关键词
活性氮
流动余辉
发射光谱
NI自由基
active nitrogen
flowing afterglow
emission spectra
NI radical