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Chin. Phys. B, 2009, Vol. 18(11): 4815-4822    DOI: 10.1088/1674-1056/18/11/034

Jet-like structures in photoelectron angular distributions

Wang Yi(王懿)a)b), Zhang Jing-Tao(张敬涛)a)†, Ren Xiang-He(任向河)a), and Xu Zhi-Zhan(徐至展)a)
a State Key Laboratory of High-field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; b Graduate School of Chinese Academy of Sciences, Beijing 100049, China
Abstract  The photoelectron angular distributions (PADs) of hydrogen atoms in an intense laser field of linear polarization are studied using the S-matrix theory in the length gauge. The PADs show main lobes along the laser polarization and jet-like structures sticking from the waist of main lobes. Our previous prediction, based on a nonperturbative scattering theory of photoionization developed by Guo et al, showing that the number of jets on one side of PADs may increase by one, three, or other odd numbers and may decrease by one when one more photon is absorbed, is confirmed by this treatment. Within the strong-field approximation, good agreement is obtained between these two quite different treatments. We further study the influence of the Coulomb attraction to PADs, by taking a Coulomb--Volkov state as the continuum state of photoelectrons. We find that under the influence of the Coulomb attraction, the PADs change greatly but the predicted phenomena still appear. This study verifies that the jet-like structures have no relation with the angular momentum of photoelectrons.
Keywords:  multiphoton ionization      photoelectron angular distributions      S-matrix theory      Coulomb--Volkov state  
Received:  19 November 2008      Revised:  20 May 2009      Accepted manuscript online: 
PACS:  32.80.Fb (Photoionization of atoms and ions)  
  32.80.Rm (Multiphoton ionization and excitation to highly excited states)  
Fund: Project supported by the Rising Star Programme of Shanghai, the National Natural Science Foundation of China (Grant No 10774153) and the National Key Basic Research Program of China (Grant No 2006CD806000).

Cite this article: 

Wang Yi(王懿), Zhang Jing-Tao(张敬涛), Ren Xiang-He(任向河), and Xu Zhi-Zhan(徐至展) Jet-like structures in photoelectron angular distributions 2009 Chin. Phys. B 18 4815

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