ELECTRON-IMPACT EXCITATION AND IONIZATION OF CU+

We have carried out the first calculations of electron-impact excitati on and ionization from the ground state of Cu+. Excitation cross secti ons from 3d(10) to the terms of the 3d(9)4s and 3d(9)4p configurations were calculated using the R-matrix method. The effects of polarizatio n on the excitation cross sections were included through the use of po larized pseudo-states within the close-coupling expansion and were fou nd to have a very small effect on excitations to the terms of 3d(9)4s, but reduced the cross section to the 3d(9)4p P-1 term by about 27%. T he excitation cross sections to the metastable terms 3d(9)4s D-3 and 3 d(9)4s D-1 were found to be dominated by resonant contributions from t he 3d(9)4p(2) D-2(e) terms of neutral copper. Furthermore, it was disc overed that the size and shape of these resonant contributions are sen sitive to configuration interaction with other low-lying resonant stat es. ionization out of the 3d subshell in Cu+ was studied using the dis torted-wave approximation. The cross section was found to be relativel y insensitive to the choice of scattering potential for the incident, ejected and scattered electron, in stark contrast to the situation in neutral copper. In addition, the effect of polarization on this cross section was investigated using a semi-empirical polarization potential and was found to be small.