Synchrotron radiation can be used to produce highly-charged ions, and to study photoexcitation and photoionization for ions of virtually any element In the periodic table. To date, with few exceptions, atomic physics studies have been limited to rare gases and a few metal vapors, and to photoexcitation energies in the VUV region of the electromagnetic spectrum. These limitations can now be overcome using photons produced by high-brightness synchrotron storage rings, such as the x-ray ring at the National Synchrotron Light Source
Several previous talks have emphasized the need of experimental data for the designing of gas neutralizers.We have started a project aimed at measuring all relevant cross sections for the charge exchange of H", U* and H* projectiles, as well as the cross sections for the production of ions in the target. The expected results of these latter measurements are shown schematically in Transparency No. 1. Each square in the table represents a full charge state distribution of recoiling ions in coincidence with the colliding hydrogen ion of given incoming and given outgoing charge state. The diagonal elements represent cross sections for production of recoiling ions with different charge states In collisions where the projectile does not undergo a charge exchange.The results of these experiments will give important information on the following questions:
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