Fluorescence yields of high-lying doubly excited states of Ar16+

The radiative and Auger decay rates of high-lying doubly excited states of multiply charged ions are calculated using wavefunctions obtained from the configuration interaction method. The fluorescence yields of all the states within the intrashell and intershell manifolds are examined and ordered in terms of the correlation quantum numbers. It is shown that the fluorescence yields of certain classes of intershell doubly excited states are quite large which are used to interpret the recent experimental observation of large average fluorescence yield of doubly excited states formed in collisions of multiply charged ions with atoms.