Bond energies of MgKr+ and MgXe+ from resonant two-color photoionization thresholds

The ionization thresholds for the metastable Mg(3s3p P-3(0)).RG((3) Pi(0)-, upsilon ''=0) states (RG=Kr.Xe) have been determined by two-color photoionization via several Mg(3s4s S-3(1)).RG(3 Sigma(+), upsilon') intermediate resonance states, From other experimental measurements and ab initio calculations, D-0(Mg(3s3p P-3(0)).RG((3) Pi(0))) = 250+/-80 cm(-1) and 500+/-150 cm(-1) for RG=Kr,Xe, respectively, from which D-0(MgKr+) and D-0(MgXe+) and calculated to be 1891+/-80 cm(-1) and 2848+/-150 cm(-1). Bonding in the MgRG(+) ions is discussed and compared to the bonding in the analogous NaRG(+) and AIRG(+) ions. (C) 1997 American Institute of Physics.