Section I. Atomic physics and related phenomena
Angular distributions of very low energy recoil ions

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Abstract

We present the first measurements of the angular distribution of recoil ions near 90 ° with respect to the incident projectile direction. Beams of 22.5 and 33 MeV chlorine ions (incident charge states q = 4,5,8) have been used as “hammer” beams incident on Ne atoms.

We do not confirm the long standing assumption that these recoil ions are ejected preferentially at angles very near 90 ° with respect to the primary beam direction, although they do have energies typically less than 5 eV. Recoil ions ejected around 90 ° have an energy distribution appreciably wider than those ejected at either larger or smaller angles.

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Present address: Physics Department, Stanford University, Stanford, CA 94305, USA.

∗∗

On visit from Institute of Microwave Technology, P.O. Box 70033, S/10044-Stockholm, Sweden.

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