Double-Exponentially Decayed Photoionization in CREI Effect： Numerical Experiment on 3D H2^＋  

作　　者：李峰 王廷营 张贵忠 向望华 希尔三世 

机构地区：[1]College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072 [2]Key Lab of Optoelectronic Information and Technical Science (Ministry of Education), Tianjin University, Tianjin 300072 [3]Institute for Physical Science and Technology, University of Maryland at College Park, MD20742, USA

出　　处：《Chinese Physics Letters》2008年第2期465-467,共3页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 10674100, and the Tianjin Municipal Commission for Science and Technology under Grant No 07JCYBJC06100.

摘　　要：On the platform of the 3D H2^＋ system, we perform a numerical simulation of its photoionization rate under excitation of weak to intense laser intensities with varying pulse durations and wavelengths. A novel method is proposed for calculating the photoionization rate： a double exponential decay of ionization probability is best suited for fitting this rate. Confirmation of the well-documented charge-resonance-enhanced ionization （CREI） effect at medium laser intensity and finding of ionization saturation at high light intensity corroborate the robustness of the suggested double-exponential decay process. Surveying the spatial and temporal variations of electron wavefunctions uncovers a mechanism for the double-exponentially decayed photoionization probability as onset of electron ionization along extra degree of freedom. Henceforth, the new method makes clear the origins of peak features in photoionization rate versus internuclear separation. It is believed that this multi-exponentially decayed ionization mechanism is applicable to systems with more degrees of motion.On the platform of the 3D H2^＋ system, we perform a numerical simulation of its photoionization rate under excitation of weak to intense laser intensities with varying pulse durations and wavelengths. A novel method is proposed for calculating the photoionization rate： a double exponential decay of ionization probability is best suited for fitting this rate. Confirmation of the well-documented charge-resonance-enhanced ionization （CREI） effect at medium laser intensity and finding of ionization saturation at high light intensity corroborate the robustness of the suggested double-exponential decay process. Surveying the spatial and temporal variations of electron wavefunctions uncovers a mechanism for the double-exponentially decayed photoionization probability as onset of electron ionization along extra degree of freedom. Henceforth, the new method makes clear the origins of peak features in photoionization rate versus internuclear separation. It is believed that this multi-exponentially decayed ionization mechanism is applicable to systems with more degrees of motion.

关 键 词：PULSARS x-ray spectra relativity and gravitation REDSHIFT 

分 类 号：O571[理学—粒子物理与原子核物理]