THE ELECTRONIC ISOTOPE SHIFT IN DIATOMIC MOLECULES
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Date
1968
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Ohio State University
Abstract
The potential energy curves of a diatomic molecule are obtained as a direct result of separating the nuclear and electronic motions. Usually the Born-Oppenheimer approximation is used to effect this separation and in this approximation the potential energy curves obtained are isotopically invariant. Experimental results have been obtained for several diatomic hydrides, in particular BH (Bauer, Herzberg, and Johns (1964) and CuH (Herzberg (1950) ), which show that the separation between the minima of two PE curves (called $\nu_{***})$ can change with isotopic substitution. Such a change in $\nu_{e}$ with isotopic substitution is called an electronic isotope shift. These shifts are shown to be theoretically calculable still within the approximation of separating nuclear and electronic motion but by relaxing somewhat the Born-Oppenheimer approximation.
Description
S.H. Bauer, G. Herzberg, and J.W.C. Johsn, J. Mol. Spectry., 13, 256 (1964). G. Herzberg, ``The Spectra of Diatomic Molecules'', Van Nostrand (1950).
Author Institution: Division of Pure Physics, National Research Council of Canada
Author Institution: Division of Pure Physics, National Research Council of Canada