Electron-impact single ionization of multiply charged manganese ions - art. no. 032706

Absolute cross sections have been measured for single ionization of Mnq+ (5 less than or equal to q less than or equal to 8) by electron impact at ene rgies ranging from the ionization thresholds to 4 keV using a new dynamic-c rossed-beams apparatus. The experimental cross sections are essentially fea tureless, but show evidence for significant contributions due to 3p-->nl (n greater than or equal to 4) inner-shell excitation followed by autoionizat ion for Mn5+ and Mn6+, and 3s-->nl (n greater than or equal to 5) excitatio n-autoionization for Mn7+ and Mn8+. The measurements for Mn6+ and Mn8+ and their interpretation are complicated by the presence of an undetermined fra ction of the primary ion beams in metastable states.