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Chin. Phys. B, 2018, Vol. 27(7): 073202    DOI: 10.1088/1674-1056/27/7/073202
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Effect of electron excitation in nonsequential double ionization by intense laser fields

Xiang Chen(陈翔)1, Qiujing Han(韩秋静)2, Jingtao Zhang(张敬涛)1
1 Department of Physics, Shanghai Normal University, Shanghai 200234, China;
2 Qingdao Binhan University, Qingdao 266555, China
Abstract  We study the double ionization process of atoms in intense laser fields. The momentum distributions of the correlated electrons are calculated. Contrary to the general expectation, we show an increasing proportion of the electrons ionized via excitation with the increasing laser intensity. These electrons generally have small energy thus they concentratedly distribute on the central region of the momentum diagram. Consequently, the central part of the momentum diagram becomes more notable in higher intensity laser fields. Further study suggests that this phenomenon is general in double ionization.
Keywords:  electron excitation      electron collision      double ionization  
Received:  29 January 2018      Revised:  08 April 2018      Accepted manuscript online: 
PACS:  32.80.Rm (Multiphoton ionization and excitation to highly excited states)  
  32.80.Fb (Photoionization of atoms and ions)  
  34.50.Rk (Laser-modified scattering and reactions)  
  42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61475168, 11674231, and 61575124), Natural Science Foundation of Shanghai, China (Grant No. 15ZR1430600), and Shanghai Gaofeng & Gaoyuan Project for University Academic Program Development, China.
Corresponding Authors:  Jingtao Zhang     E-mail:  jtzhang@shnu.edu.cn

Cite this article: 

Xiang Chen(陈翔), Qiujing Han(韩秋静), Jingtao Zhang(张敬涛) Effect of electron excitation in nonsequential double ionization by intense laser fields 2018 Chin. Phys. B 27 073202

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