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The cross section for electron-impact single ionisation of W14+ ions has beencalculated by using two different approaches, i.e., the subconfigurationaveraged distorted-wave (SCADW) method and the more involved level-to-leveldistorted-wave (LLDW) method. Both methods are found to yield very similarresults except for the 4d->5d excitation-autoionisation (EA) channels thatstraddles the ionisation threshold. Accordingly, a hybrid theoretical crosssection where the $4d\to 5d$ EA SCADW cross section is replaced by its LLDWcounterpart is in good agreement with the experimental result from anelectron-ion crossed-beams experiment. This is in contrast to pure SCADWcalculations for W14+ and neighbouring charge states which exhibit significantdeviations from the experimental near-threshold cross sections of Schury et al.[J. Phys. B 53 (2020) 015201].

Electron-impact single ionisation of W14+ ions: Subconfiguration-average and level-to-level distorted wave calculations