High-Resolution Selective Excitation of Resonance-Enhanced Multiphoton-Ionization Photoelectron Spectroscopy by Shaping Femtosecond Laser Pulses  

作　　者：程文静 张诗按 贾天卿 冯东海 孙真荣 

机构地区：[1]State Key Laboratory of Precision Spectroscopy and Department of Physics, East China Normal University, Shanghai 200062

出　　处：《Chinese Physics Letters》2014年第5期51-55,共5页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 11274116, 113740995 and 1132004, the Shanghai Science and Technology Commission under Grant Nos 11JC1403500 and 10XD1401800, the National Special Science Research Program of China under Grant Nos 2010CB923203 and 2011CB808105, and the Program of Introducing Talents of Discipline to Universities under Grant No B12024.

摘　　要：Femtosecond laser-induced resonance-enhanced multiphoton-ionization photoelectron spectroscopy （REMPI-PS） is faced with two drawbacks of low spectral resolution and poor selective excitation due to the broad spectral bandwidth. We propose a scheme to obtain a high-resolution selective excitation of （2＋1） REMPI-PS by com- bining 7r and cosinusoidal phase modulation. Our theoretical results indicate that the （2＋1） REMPI-PS signals related to neighboring excited states can be differentiated from their indistinguishable photoelectron spectra by the 7r phase modulation, and then their selective excitation can be realized by supplementally adding the cosi- nusoidal phase modulation. Furthermore, the physical mechanism of the high-resolution selective excitation of （2＋1） REMPI-PS is explained by considering the two-photon power spectrum.Femtosecond laser-induced resonance-enhanced multiphoton-ionization photoelectron spectroscopy （REMPI-PS） is faced with two drawbacks of low spectral resolution and poor selective excitation due to the broad spectral bandwidth. We propose a scheme to obtain a high-resolution selective excitation of （2＋1） REMPI-PS by com- bining 7r and cosinusoidal phase modulation. Our theoretical results indicate that the （2＋1） REMPI-PS signals related to neighboring excited states can be differentiated from their indistinguishable photoelectron spectra by the 7r phase modulation, and then their selective excitation can be realized by supplementally adding the cosi- nusoidal phase modulation. Furthermore, the physical mechanism of the high-resolution selective excitation of （2＋1） REMPI-PS is explained by considering the two-photon power spectrum.

分 类 号：TN24[电子电信—物理电子学] X831[环境科学与工程—环境工程]