Ionized electron spectra in energetic heavy ion-atom collisions

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Ionized electron spectra have been calculated for 1.4 MeV/u collisions of U32+ on Ar. The classical trajectory Monte Carlo method has been utilized with Hartree‐Fock model potentials to represent the uranium ion’s 4f‐shell, and the L‐ and M‐shells of Ar. Singly and doubly differential cross sections in ionized electron energy and angle are presented to illustrate the various collision dynamics. Projectile electron‐loss‐to‐the‐continuum and charge‐transfer‐to‐the‐continuum cross sections near 0° are analyzed and compared to one another. The electrons ionized from the L‐shell are found to be more narrowly peaked in angle than those from the M‐shell of Ar, giving raise to a slight ‘‘ridge’’ in the singly differential cross sections near 0° in the summed ionized electron spectra. The target binary peak found at an ejected electron velocity of 2vpcosΘ, is investigated as a function of scattering angle. Anomalously large cross sections for ‘‘hot’’ electrons from the U32+ ion are found at velocities significantly above that for projectile binary peak electrons.