(1 Lab of Environmental Spectroscopy, Key Lab of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031) (2 College of Physics and Electronic Information, Anhui Normal University, Wuhu 241000)
Abstract：Active nitrogen has been prepared by the hollow-cathode discharge through N2 in a flowing af-terglow 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(b1Σ＋→X3Σ－) band system. The possible formation mechanism of the electronically excited NI(b1Σ＋) was proposed to be the reaction of N(2P) in active nitrogen with C2H5I based on some quenching ex-periments. This is the first experimental evidence about the excited NI(b1Σ＋) generation through chemical reaction in gas phase, and the highest vibrational level detected is v'＝6.