The hyperfine structure in the rotational spectra of D2O: Lamb-dip measurements and quantum-chemical calculations
Résumé
Thirteen rotational transitions of the doubly deuterated isotopic species of water, D216O, have been recorded in the millimeter- and submillimeter-wave region. The Lamb-dip technique has been used to resolve the hyperfine structure due to deuterium quadrupole coupling, due to spin-rotation as well as dipolar spin-spin interactions, thus enabling the determination of the corresponding hyperfine parameters to a good accuracy. The experimental investigation has been assisted by high-level quantum-chemical calculations of the hyperfine parameters.
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