Abstract
M-shell vacancy production cross sections, identified with Auger-electron production measurements in cadmium by H+ and He2+ ions with velocities near the M-shell electron velocities v2M and taken as data for electron capture from krypton by protons with velocities of approximately 4v2M, are compared with the first-order and second-order ionisation theories. The MeV projectile ions of Z1=1, 2 in these experiments are of intermediate and high velocities, relative to v2M in the targets of medium atomic number Z2. For these data, Z1/Z2 is sufficiently large to discriminate between various ionisation theories. The ECPSSR theory, that accounts for the energy loss and Coulomb deflection of the projectile as well as for the perturbed stationary state and relativistic nature of the target M shell, gives better agreement with the experiments than first-order ionisation theories and the continuum-distorted-wave treatment of electron capture.
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