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Communication: A simple full range analytical potential for
, H–He 2
18.B. M. Smirnov and M. I. Chibisov, Sov. Phys. JETP-USSR 21(3), 624 (1965).
19.E. L. Duman and B. M. Smirnov, Opt. Spectrosc. USSR 29(3), 229 (1970).
23.J. Goodisman, Diatomic Interaction Potential Theory (Academic Press, New York, 1973).
, Yu. Ralchenko
, J. Reader
, and NIST ASD Team
, NIST Atomic Spectra Database version 5.2
(National Institute of Standards and Technology
, Gaithersburg, MD, USA
[online available at http://physics.nist.gov/asd
, accessed 17 November 2014].
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The Tang-Toennies potential for the weakly interacting systems
, H–He 2Σ+, and
is extended down to the united atom limit of vanishing internuclear distance. A simple analytic expression connects the united atom limiting potential with the Tang-Toennies potential in the well region. The new potential model is compared with the most recent
ab initio calculations for all three systems. The agreement is better than 20% (H2 and He2) or comparable with the differences in the available
ab initio calculations (H–He) over six orders of magnitude corresponding to the entire range of internuclear distances.
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