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Time-Resolved Electron Energy Distribution Function in Time-Varying Weakly Ionized Plasmas

A method for detecting the time-resolved electron energy distribution function for periodically varying plasmas is proposed. The method is applied to detecting the time-resolved distribution function for ionization wave packets externally excited in the helium positive column. The distribution function shifts to a higher one with increasing wave amplitude, yielding the two-humped distribution in a certain duration of the negative phase of fluctuated electric field due to the increase in acceleration of electrons.