The Rotational Spectrum Of Hdo: Accurate Spectroscopic And Hyperfine Parameters

Due to its importance for atmospheric and astrophysical science, a spectroscopic investigation of the rotational spectrum of the singly deuterated water molecule (HDO) was performed, spanning a large frequency range: from the millimeter-wave region up to the THz frequency domain. Sub-Doppler resolution was obtained by exploiting the Lamb-dip technique, thus allowing us to resolve the hyperfine structure of the rotational lines due to deuterium and hydrogen. The experimental determination of the hyperfine parameters involved was supported by highly accurate quantum-chemical calculations. On the whole, the present measurements allowed us to carry out an accurate spectroscopic characterization of HDO