在流动反应管中,利用高纯N2空心阴极放电制备活性氮,研究了活性氮与溴分子碰撞反应得到的发射光谱.在540~800nm波段观察到了较强的NBr(b^1Σ^+→X^3Σ^-)跃迁发射谱,在292nm处观察到了Br2(D'→A')辐射跃迁.实验结果表明,得到的NBr(b^1Σ^+)显示出了非弛豫的发射特征,最高振动能级为ν'=9.激发态的NBr(b^1Σ^+)是由活性氮中的N(^2P)原子与Br2直接反应生成的.
Active nitrogen has been prepared by hollow-cathode discharge of high pure nitrogen in a flow reactor, and the emission spectra obtained in the reaction of active nitrogen with Br2 have been studied. The strong emission spectra of NBr(b^1Σ^+→X^3Σ^- ) in the range of 540-800 nm have been observed when bromine is added to a stream of active nitrogen, and the spectra around 292 nm is ascribed to the transition of Br2(D'→A'). The results show that the excited state NBr(b^1Σ^+) are found to exhibit vibrationally unrelaxed emissions (from up to v'=9), and the electronically excited NBr(b^1Σ^+) is formed directly by the reaction of excited nitrogen atom N(^2p) with Br2.