利用激光光谱技术得到NO分子经由电子态C2Σ←X2Π跃迁的多光子共振离化光谱.NO分子通过中间共振电子态C2Σ,实现了五光子共振离化过程. 根据实验计算得到了NO分子C2Σ态平衡位置的力常数k=(2.44±0.08)×103 N·m-1.
The resonance enhanced multiphoton ionization (REMPI) spectrum in the range of 490～580 nm of NO is obtained. The spectrum is attributed to C2Σ←X2Π transition. NO molecules are ionized via the resonant intermediate C2Σ state and by (3+2) REMPI process. The value for force constant of the C2Σ state is given.
[1] 邬承就, 魏合理, 袁怿谦, 马志军, 曹百灵, 龚知本. 激光长程吸收光谱法测量高分辨率大气吸收光谱 [J]. 光学学报 2002.doi:10.3321/j.issn:0253-2239.2002.02.025
[2] Peng W X, LEDINGHAND K W D, Marshall A. Urban air pollution:laser-based procedure for the detection of NOx gases [J]. ANALYST 2000, 120.
[3] Shan-Hu Lee, Jun Hirokawa, Yoshizumi Kajii. New method for measuring low NO concentrations using laser induced two Photon ionization [J]. Review of Scientific Instruments 1997, 7(7).
[4] Shu J., Rosenwaks S., Bar I.. The use of rovibrationally excited NO photofragments as trace nitrocompounds indicators [J]. Applied physics, B. Lasers and optics 2000, 4(4).
[5] Pastel R L, SAUSA R C. Detection of NO and NO2 by (2+2 resonance-enhanced multiphoton ionization and photoacoustic spectroscopy near 454 nm [J]. Applied Optics 1996, 35(21).
[6] Brugman T M, STOFFEL G G M. Imaging and post processing of laser-induced fluorescence from NO in a diesel engine [J]. Applied Phys B 1997, 64.
[7] Herzberg G. Molecular spectra and molecular structure [M]. 北京:科学出版社 1986.
