Extensions of the recently introduced “Morse/long-range” (MLR) potential function form allow a straightforward treatment of a molecular state for which the inverse-power long-range potential changes character with internuclear separation. Use of this function in a direct-potential-fit analysis of a combination of new fluorescence data for , , and with previously reported data for the and states yields accurate, fully analytic potentials for both states, together with the analytic “adiabatic” Born–Oppenheimer breakdown radial correction functions which are responsible for the difference between the interaction potentials and well depths for the different isotopologues. This analysis yields accurate well depths of and and scattering lengths of and for the ground-states of and , respectively, as well as improved atomic radiative lifetimes of for and for .
Accurate analytic potentials for and from 2 to 90 Å, and the radiative lifetime of
Robert J. Le Roy, Nikesh S. Dattani, John A. Coxon, Amanda J. Ross, Patrick Crozet, Colan Linton; Accurate analytic potentials for and from 2 to 90 Å, and the radiative lifetime of . J. Chem. Phys. 28 November 2009; 131 (20): 204309. https://doi.org/10.1063/1.3264688
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