Abstract
The low-energy electron-impact-excitation of Zn+ is investigated using the R-matrix method. The close-coupling expansion includes 15 target states of the 3d104s, 4p, 5s, 4d, 6p, and 3d94s2, 4s4p configurations in the LS-coupling scheme. Particular attention is paid to the accurate representation of target wavefunctions in the extensive multiconfiguration scheme. Both the core-valence correlation and relaxation of outer electrons are shown to be important. The complicated resonance structure is revealed in the low-energy region, and resonance scattering makes a relatively large contribution to the total cross sections, especially for the 3d104s-3d94s2 transition. Total cross sections for the 4s-4p transition are compared with experimental data and other calculations. Taking into account the cascade effects, the present close-coupling calculations and the crossed-beams measurements by Rogers et al (Rogers W T, Dunn G H, Olsen J O, Reading M and Stefani G 1982 Phys. Rev. A 25 681 ) are found to be in very good agreement within a wide energy range. The merged-beam measurements by Smith et al (Smith S J, Man K F, Mawhorter R J, Williams I D and Chutjian A 1991 Phys. Rev. Lett. 67 30) exceed the present results near the excitation threshold, but at higher energies the experimental values are somewhat lower than the theory predicts. On the other hand, the recent relative measurement by Imre et al (Imre A I, Gomonai A N, Vukstich V S and Nemeth A N 1998 JETP Lett. 68 646), normalized at 30 eV to the present data, gives rise to 20% higher cross sections in the low-energy region.
Published Version
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