Abstract
We have investigated the performance of classical models in the description of the single and double ionization of argon induced by 4-fs, 750-nm linearly polarized laser pulses by comparing the calculated quantities with existing experimental data, primarily the results of the systematic measurements of K\"ubel at al. [Phys. Rev. A 93, 053422 (2016)], in the intensity range (1--10)$\phantom{\rule{0.16em}{0ex}}\ifmmode\times\else\texttimes\fi{}\phantom{\rule{0.16em}{0ex}}{10}^{14}\phantom{\rule{0.28em}{0ex}}{\mathrm{Wcm}}^{\ensuremath{-}2}$. The comparison involved different one- and two-electron models based on the classical ensemble approximation. The analysis covered single- and double-ionization probabilities and their ratios, longitudinal momentum distributions of the ${\mathrm{Ar}}^{+}$ and ${\mathrm{Ar}}^{2+}$ recoiled ions, and the carrier-envelope-phase-dependent asymmetry of the yield of the ${\mathrm{Ar}}^{+}$ and ${\mathrm{Ar}}^{2+}$ ions.
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