Collisional X-Ray Excitation in Solid and Gaseous Targets by Heavy-Ion Bombardment

Large differences have been found in the x-ray yields produced by 22.5- and 48-MeV iodine ions incident on solid ($_{34}\mathrm{Se}$) and gaseous ($_{35}\mathrm{Br}$ and $_{36}\mathrm{Kr}$) targets. These differences are attributable to the steady-state excitation of the penetrating ion prior to the vacancy producing collision, and yield information on the state of energetic ions in solids.