Disclaimer: This material is being kept online for historical purposes. Though accurate at the time of publication, it is no longer being updated. The page may contain broken links or outdated information, and parts may not function in current web browsers. Visit https://espo.nasa.gov for information about our current projects.


Terahertz spectroscopy of ground state HD18O

Yu, S., J. C. Pearson, B. Drouin, C. E. Miller, K. Kobayashi, and F. Matsushima (2016), Terahertz spectroscopy of ground state HD18O, Journal of Molecular Spectroscopy, 328, 27-31, doi:10.1016/j.jms.2016.07.005.

Terahertz absorption spectroscopy was employed to measure the ground state pure rotational transitions of the water isotopologue HD18 O. A total of 105 pure rotational transitions were observed in the 0.5–5.0 THz region with  100 kHz accuracy for the first time. The observed positions were fit to experimental accuracy using the Euler series expansion of the asymmetric-top Hamiltonian together with the literature Microwave, Far-IR and IR data in the ground state and m2 . The new measurements and predictions reported here support the analysis of astronomical observations by high-resolution spectroscopic telescopes such as SOFIA and ALMA where laboratory rest frequencies with uncertainties of 1 MHz or less are required for proper analysis of velocity resolved astrophysical data.

PDF of Publication: 
Download from publisher's website.
Research Program: 
Upper Atmosphere Research Program (UARP)