Electron-Impact Ionizaton of Mn^{6+}

Kengo Moribayashi and Yong-Ki Kim

JAERI, Osaka, and NIST

The Binary-Encounter-Bethe (BEB) model for an ion target is used to calculate
the 
corss section for the ionization of Mn^{6+} by electron-impact.  The direct
ionization 
cross section calculated from the BEB model is far below the measured cross
section,
indicating the presence of a large number of indirect ionization channels,
such as 
autoionization of inner-shell excited levels.  There is also an idication that
most 
target ions are in the 3p^6 4s metastable state, rather than in the 3p^6 3d
ground state.