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

作     者：张贵银 靳一东 

作者机构：College of Mathematics and PhysicsNorth China Electric Power University.Baoding 071003 

出 版 物：《Chinese Optics Letters》 (中国光学快报（英文版）)

年 卷 期：2008年第6卷第11期

页      面：800-803页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

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

主　　题：Ionization Ionization of liquids Lasers Molecules Multiphoton processes Photoionization Photons Pulsed laser applications Pulsed laser deposition Resonance 

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.