title: [Resonance-enhanced multiphoton ionization spectrum of NO by D2 sigma state].
abstract: NO is an important pollutant molecule, and plays a key role in generating photochemical smog and destroying O3 in the atmosphere. So researchers have always been interested in it. In our experiment, the optical parameter generator and amplifier (EKSPLA) pumped by Nd:YAG (Quantel) laser were used as the radiation source. The REMPI spectrum of NO in the region of 460-570 nm was obtained. Based on theoretical calculation, most of the lines were attributed to the X2 pi --> D2 sigma transition. The ionization pathway was discussed in detail, which can be shown as NO(X2 pi) (3h nu)--> NO(D2 sigma) (2h nu)--> NO+ + e. The vibration fundamental and force constant of NO (D2 sigma) state were calculated. The results are omega(e) = 2339.2 cm(-1) and k = 2.41 x 10(5) dyn x cm(-1). For future work, the resolution of the radiation source will be improved in order to obtain more information of the D2 sigma state.
authors.affiliation: College of Physics Science and Technology, Hebei University, Baoding 071002, China.
authors.forename: Gui-yin
authors.initials: GY
authors.lastname: Zhang
authors.forename: Lian-shui
authors.initials: LS
authors.lastname: Zhang
authors.forename: Xiao-dong
authors.initials: XD
authors.lastname: Yang
authors.forename: Bo
authors.initials: B
authors.lastname: Sun
authors.forename: Xiao-hui
authors.initials: XH
authors.lastname: Zhao