K-shell x-ray production in 6C, 8O, 9F, 11Na, 12Mg, and 13Al by 0.5-8.0-MeV helium ions
Abstract
K-shell x-ray production cross sections are reported for incident 4He ions for elements with K-shell binding energies between 277 eV (C) and 1487 eV (Al). The data are compared with the first-order Born approximation (plane-wave Born approximation for direct ionization and Oppenheimer-Brinkman-Kramer approximation for electron capture) and to the energy loss and Coulomb deflection effects, perturbed stationary-state approximation with relativistic correction (ECPSSR) theory. The energy of the helium ions ranged from 0.5 to 6.0 MeV for He+ and 6.5 to 8.0 MeV for He2+. The targets used in these measurements were 6C, 8O, 9F, 11Na, 12Mg, and 13Al. Except for a systematic overprediction of the data at the lower projectile velocities, the ECPSSR theory is found to fit the data. The first-order Born theory is found to fit the data at higher energy, but greatly overpredicts the data at low energy.
- Publication:
-
Physical Review A
- Pub Date:
- December 1991
- DOI:
- 10.1103/PhysRevA.44.7252
- Bibcode:
- 1991PhRvA..44.7252Y
- Keywords:
-
- 34.50.Fa;
- Electronic excitation and ionization of atoms