Influence of laser intensity on the double-resonance multiphoton ionization process of NO molecule  

作　　者：张贵银 靳一东 

机构地区：[1]College of Mathematics and Physics,North China Electric Power University.Baoding 071003

出　　处：《Chinese Optics Letters》2008年第11期800-803,共4页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.10647130);the Doctoral Foundation of North China Electric Power University (No.200612003).

摘　　要：The analytic formula of the ionization efficiency in the process of double resonance enhanced multi-photon ionization （DREMPI） is derived from the dynamic rate equation about the interaction of photon and material. Based on this formula, the ionization efficiency and the laser power index versus laser intensity in the DREMPI process of NO molecule, via A2E and S2E intermediate resonant states, is numerically simulated. It is shown that the ionization efficiency of NO molecule increases with the laser intensity until getting saturation, while the laser power index decreases with the enhancement of the laser intensity and changes to zero at last. The variation of the laser power index with the laser intensity indicates that the ionization efficiency reaches saturation in the one, two, and three excitation steps respectively. It is also found that the narrower the laser pulse duration is, the higher becomes the laser intensity for saturation.The analytic formula of the ionization efficiency in the process of double resonance enhanced multi-photon ionization （DREMPI） is derived from the dynamic rate equation about the interaction of photon and material. Based on this formula, the ionization efficiency and the laser power index versus laser intensity in the DREMPI process of NO molecule, via A2E and S2E intermediate resonant states, is numerically simulated. It is shown that the ionization efficiency of NO molecule increases with the laser intensity until getting saturation, while the laser power index decreases with the enhancement of the laser intensity and changes to zero at last. The variation of the laser power index with the laser intensity indicates that the ionization efficiency reaches saturation in the one, two, and three excitation steps respectively. It is also found that the narrower the laser pulse duration is, the higher becomes the laser intensity for saturation.

关 键 词：IONIZATION Ionization of liquids Lasers MOLECULES Multiphoton processes PHOTOIONIZATION PHOTONS Pulsed laser applications Pulsed laser deposition Resonance 

分 类 号：O561[理学—原子与分子物理]