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The photoionization cross sections to produce Hg+ and Hg2+ have been measured from their respective thresholds at 10.434 and 29.186 eV to a high-energy limit of 72 eV. For single ionization the cross section rises to a maximum at more than 10 eV above the threshold associated with d-electron removal. The cross section for double ionization is a nonnegligible fraction of the total cross section.
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Cairns et al. (1970) studied this question.
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