# ROTATIONAL CONSTANTS OF MOLECULES WITH DOUBLE-MINIMUM POTENTIALS.

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/15719

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 Title: ROTATIONAL CONSTANTS OF MOLECULES WITH DOUBLE-MINIMUM POTENTIALS. Creators: Watson, J. K. G. Issue Date: 1969 Publisher: Ohio State University Abstract: The rotational constants of molecules in successive levels of a symmetric double-minimum potential show a characteristic staggering that is fairly well represented by a term in $$, where Q is the coordinate for the double-minimum motion. A precise representation can be obtained by adding a term in$$, but the observed coefficients of $$are much larger than expected from the expansions of the moments of inertia.^{1} The present work uses a term in$$ rather than in $, P$ being the momentum conjugate to Q. This term in $$originates from the second-order effects of Coriolis interaction with the other vibrations. For a quartic potential with a negative quadratic barrier the two alternative expressions provide identical fits to the observed constants, because the virial theorem gives a linear relation between ,  and$$. Preliminary calculations show that the observed coefficients of  are of the correct order of magnitude for this Coriolis mechanism. Description: $^{1}$ S. I. Chan, J. Zinn and W. D. Gwinn, J. Chem. Phys. 54, 1319 (1961). Author Institution: Department of Chemistry, The University URI: http://hdl.handle.net/1811/15719 Other Identifiers: 1969-H-3