Abstract
Collisions in which a fast highly charged ion passes within the orbit of K electrons of a target gas atom are selected by emission of a K x‐ray from the projectile or target. Measurement of the projectile charge state after the collision, in coincidence with the K x‐ray, allows measurement of the charge‐transfer probability during these close collisions. When the projectile velocity is approximately the same as that of target electrons, a large number of electrons can be transferred to the projectile in a single collision. The electron‐capture probability is found to be a linear function of the number of vacancies in the projectile L shell for 47‐MeV calcium ions in an Ar target.
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