title: [Laser fluorescence excited spectrum of NO via alpha2sigma<--chi2pi transition].
abstract: Two-photon fluorescence excited spectrum of NO induced by Nd: YAG laser pumped optical parameter generator/amplifier as excitation source was obtained in the range of 420-472 nm. With this technique, the structure of the energy levels of NO molecule in alpha2sigma electronic state was investigated. The peaks of the spectrum were attributed to alpha2sigma(v' = 0,1)<--chi2pi(v" = 0) transition. The near square dependence of fluorescence signal on the laser intensity indicates a two-photon process. The ground-vibrational-state oscillation frequency and the force constant of alpha2sigma state were calculated. The fluorescence lifetime of alpha2sigma(v' = 0) state under the pressure of 266 Pa was also obtained by measuring fluorescence decay curve of alpha2sigma(v' = 0) states. It is about 53.76 ns. Fitting the curve of the fluorescence radiant lifetime versus pressure, the spontaneous radiant lifetimes and the rate coefficient of nonradiative transition relaxation of alpha2sigma(v' = 0,1) states were deduced.
authors.affiliation: College of Physics Science and Technology, Hebei University, Baoding 071002, China.
authors.forename: Lian-shui
authors.initials: LS
authors.lastname: Zhang
authors.forename: Gui-yin
authors.initials: GY
authors.lastname: Zhang
authors.forename: Xiao-hui
authors.initials: XH
authors.lastname: Zhao
authors.forename: Xiao-dong
authors.initials: XD
authors.lastname: Yang
authors.forename: Yi
authors.initials: Y
authors.lastname: Li
mesh_terms: D005453:Fluorescence; D007834:Lasers; D008956:Models, Chemical; D008958:Models, Molecular; D009589:Nitrogen Oxides / Q000737:chemistry*; D010777:Photochemistry; D017785:Photons; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013057:Spectrum Analysis / Q000379:methods
chemical_list: D009589:Nitrogen Oxides