The isotopic dependence of the spin-rotation interaction: the rotational spectrum of cadmium hydride in its XΣ state |
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Authors: | Thomas D Varberg |
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Affiliation: | Department of Chemistry, Macalester College, 1600 Grand Ave., St. Paul, MN 55105, USA |
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Abstract: | Far-infrared rotational transitions within the X2Σ+ (v=0) state of cadmium hydride (CdH) were recorded over the range N″=2-17 for 12 different isotopomers, using the technique of tunable far-infrared (TuFIR) spectroscopy. The molecule was made by heating cadmium metal in the presence of a DC electric discharge in hydrogen. Fine structure arising from the electron spin-rotation interaction and hyperfine structure from the 111Cd, 113Cd, and 1H nuclei were resolved and analyzed. All of the isotopic data were fitted together using a Hamiltonian containing mass-independent, Dunham-type rotational parameters Ukl and small correction terms Δkl described by Watson [J. Mol. Spectrosc. 80 (1980) 411]. The spin-rotation interaction was modeled in an analogous way using Dunham-like Uγ,kl parameters, and fitting its isotopic dependence properly required the use of four Δγ,kl correction terms. |
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Keywords: | Cadmium hydride CdH Rotational spectrum Far-infrared Spin-rotation |
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