A production of large amount of ions with low temperature (less than 100 eV), low momentum spread and narrowed charge state distribution by petawatt-class short-pulse laser is under consideration. Residual ion energy as the least unavoidable ion energy after ionization of gases by a short intense laser pulse is calculated as a function of laser pulse parameters. Electron thermal energy coupling to the ions is estimated taking into account a multi-group structure of free electrons produced by optical field ionization.
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