Research Papers in Physics and Astronomy


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Published in Physical Review A Volume 35, Number 1, January 1, 1987. Copyright © American Physical Society; used by permission.


Recoil ions emitted at 70° from H+-Ar and at 50° and 70° from H+-Kr collisions at 20-70 keV were analyzed by an electrostatic spectrometer. Ions selected in this way result from collisions at very small, essentially zero, impact parameters. Charge states up to 6 + were identified in the spectrum. The cross section for each charge state was measured. The data indicate that these close collisions produce a larger fraction of ions in high charge states than more distant collisions.

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