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Electron impact on K+: mechanisms for extreme ultraviolet emission

A series of R-matrix calculations on K+ is used to derive electron excitation and ionization cross sections. The excitation cross section to the 4s and 3d levels leading to the K+ 60.1, 60.8 and 61.3 nm emission lines shows a poor agreement with the cross beam experiment of Zapesochny et al (1986 Zh. Eksp. Teor. Fiz. 90 1972 (Engl. Transl.: Sov. Phys.—JETP 63 1155)). Cross sections are also presented for exciting the 4p, 5s and 4d levels, the autoionizing 3s open-shell levels, and for ionization. It is shown how pseudoresonances in the calculated cross section can be eliminated by increasing the target basis.