Masters Theses

Date of Award

12-1988

Degree Type

Thesis

Degree Name

Master of Science

Major

Physics

Major Professor

Marianne Breining

Abstract

We have coincidentally measured the projectile ion charge state and the target recoil ion charge state after the collision, and the energy of a free electron emerging from the same collision with a velocity close to the beam velocity, for 1 MeV/u bare and one electron oxygen and carbon projectiles colliding with neon targets. The goal of this experiment is to answer the following questions:

1. If a free electron moving with a velocity close to the beam velocity is produced, a cusp electron, what is the most probable recoil ion charge state?

2. If, in addition, the exit charge state of the projectile is determined, what is the most probable recoil ion charge state?

3. If a recoil ion of a particular charge state and a projectile ion of a particular charge state are produced in the same collision, how probable is the production of a free electron moving with a velocity close to the beam velocity?

Most cusp electrons accompany a projectile which does not change charge. The most probable recoil ion charge state for this case lies between two and three. When the projectile captures a target electron into a bound state in addition to a cusp electron being produced, the recoil ion charge state distribution shifts towards higher charge states. Electron loss by the projectile does not produce such a large shift. This points to cusp electrons produced in coincidence with projectile electron loss and produced by projectiles which do not change charge being associated with a more gentle larger impact parameter collision.

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