Abstract
Single and double ionization of magnesium and calcium atoms following Nd: YAG laser multiphoton excitation at 1064 and 532 nm have been studied by employing pulses of 35 ps and 200 ps duration at intensities of the order of 1010–2×1013 W/cm2. The dependence of ion formation on the laser intensity has been measured and the slopes of the linear parts of the log-log plots and the ratios of saturation intensities for two pulse durations have been compared with the predictions of the scaling law. No evidence for a pure direct double ionization process has been obtained.
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Shao, Y.L., Zafiropulos, V., Georgiadis, A.P. et al. Multiphoton ionization of magnesium and calcium atoms by short and intense laser pulses. Z Phys D - Atoms, Molecules and Clusters 21, 299–305 (1991). https://doi.org/10.1007/BF01438401
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DOI: https://doi.org/10.1007/BF01438401