Photoionization efficiency data for HgKr+and HgXe+have been obtained in the region of 730ndash;1290 Aring;. The ionization energies (IE) of HgKr and HgXe are determined to be 10.056plusmn;0.012 (1233plusmn;1.5 Aring;) and 9.709plusmn;0.011 eV (1277plusmn;1.5 Aring;), respectively. Using these values, the known dissociation energies of HgKr and HgXe, and the IE of Hg, the binding energies for the groundhyphen;state mercuryhyphen;rare gas molecular ions are calculated to be 0.393plusmn;0.013 eV for HgKr+and 0.748plusmn;0.013 eV for HgXe+. By analyzing the shifts in energy between corresponding autoionization peaks observed in the Kr+, HgKr+, Xe+, and HgXe+spectra and by assuming the charge inducedhyphen;dipole interaction to be the dominant interaction at the equilibrium bond distances for HgKr and HgXe, the equilibrium bond distances for HgKr and HgXe are deduced to be 3.98 and 4.23 Aring;, respectively. The latter values are in excellent agreement with values determined by previous spectroscopic studies.
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