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The rotational spectra of205TI19F and203TI19F, molecular constants and break-down of the Born-Oppenheimer approximation

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Zeitschrift für Physik D Atoms, Molecules and Clusters

Abstract

At wavelengths near 1 mm three rotational transitions of205Tl19F and203Tl19F have been observed. The analysis including previous measurements on rotational transitions at larger wavelengths resulted in sets of the Dunham coefficientsY 01,Y 11,Y 21,Y 31,Y 02,Y 12, andY 03 of the two isotopic species. With these microwave data the constantsY 10 ≈ ω e and −Y 20 ≈ ωe xe were determined. The parameters of the Dunham potentiala 0,a 1,a 2,a 3,B e andr e are given. The Dunham coefficientsY mn with the smallest relative experimental error show deviations from the general mass relations between isotopic species indicating a violation of the Born-Oppenheimer approximation.

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  1. Institut für Molekülphysik der Freien Universität Berlin, Germany

    J. Hoeft & K. P. R. Nair

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  1. J. Hoeft
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  2. K. P. R. Nair
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Hoeft, J., Nair, K.P.R. The rotational spectra of205TI19F and203TI19F, molecular constants and break-down of the Born-Oppenheimer approximation. Z Phys D - Atoms, Molecules and Clusters 5, 345–349 (1987). https://doi.org/10.1007/BF01385465

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  • DOI: https://doi.org/10.1007/BF01385465

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