The 584 Aring; photoelectron spectrum of mercury vapor exhibits weak peaks corresponding to formation of the excited (5d)10(6p)2P1sol;2,3sol;2ionic states, in addition to the onehyphen;electron transitions, which produce the (5d)10(6s)2S1sol;2and (5d)9(6s)22D5sol;2,3sol;2states of Hgplus;. Although the2P1sol;2,3sol;2states are forbidden by the usual shakeup mechanism, they can occur either by a ``conjugate'' shakeup process or by configuration interaction (CI) in the initial state. We present calculations which indicate that the latter is responsible for sim;80percnt; of the2P1sol;2,3sol;2intensity observed. The 304 Aring; photoelectron spectrum provides evidence for formation of additional excited ionic states which may have the configuration (5d)9(6p)2andsol;or (5d)96s7s. Our calculations show that the energies of these states are in the region of peaks experimentally observed. The (5d)9(6p)2states can be formed by the initialhyphen;state CI mechanism, whereas the (5d)96s7sstates are attainable via the shakeup process. The probabilities for these two transitions are comparable.
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