中国物理B ›› 1993, Vol. 2 ›› Issue (5): 345-355.doi: 10.1088/1004-423X/2/5/003

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EFFECT OF THE LASER TRANSVERSE SPATIAL DISTRIBUTION ON MULTIPHOTON IONIZATION PROCESSES

林美荣, 陈文驹, 张包铮, 刘耀明, 李林枫   

  1. Institute of Modern Optics, Nankai University, Tianjin 300071, China
  • 收稿日期:1992-08-11 出版日期:1993-05-20 发布日期:1993-05-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China.

EFFECT OF THE LASER TRANSVERSE SPATIAL DISTRIBUTION ON MULTIPHOTON IONIZATION PROCESSES

LIN MEI-RONG (林美荣), CHEN WEN-JU (陈文驹), ZHANG BAO-ZHENG (张包铮), LIU YAO-MING (刘耀明), LI LIN-FENG (李林枫)   

  1. Institute of Modern Optics, Nankai University, Tianjin 300071, China
  • Received:1992-08-11 Online:1993-05-20 Published:1993-05-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China.

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摘要： In this paper, the dependence of the photoionization cross section σ2, total ion number Ni and the FWHM of photoionization spectral line in resonant multiphoton ionization processes(RMPI) upon the parameter C of the laser transverse spatial distribution has been studied. Considering the effects of spatial coordinate on the resonant multiphoton absorption cross section σ1, the limited dimension of the laser-molecular interaction volume and threshold of laser intensity for RMPI, we deduce the expression of σ2 vs the parameter C. We calculated the value of σ2 for (2+2)PI of benzene by numerical method, and com-pared the result with that obtained by Bruzzeste et al. In additon, we also present the total ion number of photoionization and the FWHM of photoionization spectral line as a function of the parameter C.

Abstract: In this paper, the dependence of the photoionization cross section $\sigma$2, total ion number Ni and the FWHM of photoionization spectral line in resonant multiphoton ionization processes (RMPI) upon the parameter C of the laser transverse spatial distribution has been studied. Considering the effects of spatial coordinate on the resonant multiphoton absorption cross section $\sigma$1, the limited dimension of the laser-molecular interaction volume and threshold of laser intensity for RMPI, we deduce the expression of $\sigma$2 vs the parameter C. We calculated the value of $\sigma$2 for (2+2)PI of benzene by numerical method, and com-pared the result with that obtained by Bruzzeste et al. In additon, we also present the total ion number of photoionization and the FWHM of photoionization spectral line as a function of the parameter C.

中图分类号:  (Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))

  • 33.80.Rv
33.70.Jg (Line and band widths, shapes, and shifts)