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Influence of Laser Intensity Fluctuations in Multiphoton Ionization Processes

In this paper we analyse the influence of laser power intensity fluctuations in multiphoton ionization processes. In particular, we have carried out the analysis for the specific case of four-photon ionization of benzene molecules, which we have recently investigated both experimentally and theoretically. We have calculated the total ion yield for the above process by taking into account the experimentally observed energy fluctuations of our pulsed laser system and compared it to the value obtained in the hypothesis of perfect pulse-to-pulse reproducibility. Finally, we also report the results obtained by using different Gaussian distributions for the laser energies, thus testing the sensitivity of the ion yield to the laser intensity spread in more general conditions.