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The role of hollow states intermediately produced in electron-impact ionization of metastable He-like $N{}^{5+}(1s2s{\phantom{\rule{0.16em}{0ex}}}^{3}{S}_{1})$ ions has been investigated in detail. A crossed-beam setup and suitable experimental techniques were employed for the measurement of accurate absolute cross sections and precise energy-scan data. Fine structures arising from $K$-shell excitations and associated resonances have been observed for this two-electron ion with less than $\ifmmode\pm\else\textpm\fi{}$0.5 eV uncertainty on the energy scale. Fine details, such as interference of the reaction pathways of direct ionization and excitation with capture of the incident electron followed by double-Auger decay, could be revealed. Ab initio calculations based on the convergent close coupling (CCC) approach are in good agreement with the experiment.

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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>Double</mml:mi><mml:mo>−</mml:mo><mml:mi>K</mml:mi><mml:mo>−</mml:mo><mml:mi>vacancy</mml:mi></mml:math>states in electron-impact single ionization of metastable two-electron<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>N</mml:mi><mml:msup><mml:mrow /><mml:mrow><mml:mn>5</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:mrow><mml:mo>(</mml:mo><mml:mn>1</mml:mn><mml:mi>s</mml:mi><mml:mn>2</mml:mn><…

Double−K−vacancystates in electron-impact single ionization of metastable two-electronN5+(1s2<…