Calculations ofQvalues in single- and double-charge-transfer collisions of highly charged ions with atoms

Close-coupling calculations are carried out for the Q values for electron capture processes in collisions of multiply charged ions with atoms over a broad range of energies. For single-capture processes the results for ${\mathrm{N}}^{7+}$+He and ${\mathrm{O}}^{8+}$+He collisions are in good agreement with the experimental data of Wu et al. [preceding paper, Phys. Rev. A 50, 502 (1994)]. To compare with the experimental Q values for the transfer ionization (TI) and the true double-capture (TDC) processes, an independent-electron model was used to calculate double-electron-capture cross sections. By combining with the calculated average fluorescence yields, the theoretical Q values for TI and TDC processes are also found to be in fair agreement with the experimental data. We also compared the Q values calculated by the close-coupling method and by the classical-trajectory Monte Carlo method.