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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. 相似文献
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