NEAR-DISSOCIATION EXPANSIONS AND DISSOCIATION-ENERGIES FOR MG+ (RARE-GAS) BIMERS

This paper describes the use of fits to near-dissociation expansions (NDE's) for performing optimum vibrational level energy extrapolations to determine diatom dissociation energies, together with realistic estimates of the uncertainties due to model-dependence. The imposition of extended near-dissociation theory constraints on the leading deviation from limiting near-dissociation behavior is introduced and applied for the first time. Fits of recently determined vibrational energies for Mg+-Ar, Mg +-Kr, and Mg+-Xe to near-dissociation expansions yield improved estimates of the dissociation energies and realistic predictions for the total number and extrapolated energies of upper vibrational levels for both the A 2Π and X 2Σ+ states. A combined analysis of the data for the A 2Π1/2 and 2Π3/2 states, and of the vibrationally-dependent spin-orbit splittings, yields particularly compact internally consistent results for these systems. © 1994 American Institute of Physics.