Double <i>K</i>-Shell Ionization of Ar by 197-MeV/u Xe⁵⁴⁺ Ion Impact

Abstract

We present an experimental study on the double K-shell ionization of argon in single collisions with the Xe54+ ion at 197 MeV/u. The X-ray spectra of multi-ionized argon are measured at the observation angles of 90° and 145° with respect to the projectile beam. The target K X-ray satellite and hypersatellite lines are analyzed with a fitting model and the cross-section ratio of double to single K-shell ionization is derived. The experimental results are compared to the relativistic time-dependent, two-center calculations, and a reasonable agreement is reached.

Keywords

• double <i>K</i>-shell ionization
• heavy ion
• X-ray emission
• <i>K</i>-shell hollow atom