Br ions with energies of 13.9 and 25 MeV from the Oak Ridge tandem accelerator have been used to measure ionic charge-state distributions in dilute gas targets of H2, He, and Ar. A least-squares technique has been developed to obtain complete sets of electron charge-exchange cross sections from any number and range of measured nonequilibrium charge distributions. Characteristic irregularities, which originate in the atomic shell structure of the Br ions, have been found in the cross sections for capture of a sing]. e electron. Multiple electron capture and loss, as well as equilibrium charge distributions, are discussed,

No abstract

No abstract

The energy systematics of single and double K-shell-vacancy production in titanium have been investigated near the limit of zero target thickness for incident chlorine ions over an energy range of 7 -15 MeV/amu. Single and double K-shell-vacancy production cross sections have been measured for projectiles incident with zero, one, and two initial K-shell vacancies. Single and double K-shellto-E-shell electron-transfer cross sections have been obtained indirectly using differencing procedures based on the projectile-charge-state dependence of single and double K-shell-vacancy production. The measured cross sections have been compared to theoretical models for direct ionization and inner-shell electron transfer. Together with previously reported data, these cross sections also have been used to investigate the relative importance of these mechanisms for K-shell-vacancy production in heavy-ionatom collisions over a range of scaled velocities of 0.24 (Vl /V2K & 1.29.

No abstract