Abstract
We present observations of intense beams of energetic negative hydrogen ions and fast neutral hydrogen atoms in intense (5 × 1019 W/cm2) laser plasma interaction experiments, which were quantified in numerical calculations. Generation of negative ions and neutral atoms is ascribed to the processes of electron capture and loss by a laser accelerated positive ion in the collisions with a cloud of droplets. A comparison with a numerical model of charge exchange processes provides information on the cross section of the electron capture in the high energy domain.
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