Theoretical Manifestation of the Broadening Effect on Photoelectron Angular Distributions
ZHANG Jing-Tao1, ZHOU Lan2, ZHANG Wen-Qi1, XU Zhi-Zhan1, GUO Dong-Sheng2, R. R. Freeman3
1Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, PO Box 800-211, Shanghai 201800
2Department of Physics, Southern University and A&M College, Baton Rouge, Louisiana 70813, USA
3Department of Applied Science, University of California, Davis, California 95616, USA
Theoretical Manifestation of the Broadening Effect on Photoelectron Angular Distributions
ZHANG Jing-Tao1;ZHOU Lan2;ZHANG Wen-Qi1;XU Zhi-Zhan1;GUO Dong-Sheng2;R. R. Freeman3
1Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, PO Box 800-211, Shanghai 201800
2Department of Physics, Southern University and A&M College, Baton Rouge, Louisiana 70813, USA
3Department of Applied Science, University of California, Davis, California 95616, USA
Abstract： The broadening effect in photoelectron angular distributions (PADs) observed by Freeman et al. is studied theoretically. Using a nonperturbative scattering theory developed for multiphoton ionization with the inclusion of spontaneous emission, we calculate the PADs for above-threshold ionization (ATI) peaks. The numerical calculations from our theory reproduce the kinetic-energy dependence and the laser-intensity dependence of PADs of ATI peaks observed by Freeman et al., [Phys. Rev. Lett. 57 (1986) 3156] and provide an evidence for the existance of the ponderomotive momentum of intense laser fields.
2003, Vol. 20 
