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.
Received: 11 August 1992
Accepted manuscript online:
PACS:
33.80.Rv
(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))
Fund: Project supported by the National Natural Science Foundation of China.
Cite this article:
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) EFFECT OF THE LASER TRANSVERSE SPATIAL DISTRIBUTION ON MULTIPHOTON IONIZATION PROCESSES 1993 Acta Physica Sinica (Overseas Edition) 2 345
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