Laboratory millimeter and submillimeter spectra of HNO and DNO

Astronomy and Astrophysics – Astronomy

Scientific paper

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Hydrogen Compounds, Interstellar Gas, Line Spectra, Millimeter Waves, Nitrogen Compounds, Submillimeter Waves, Astronomical Models, Radicals, Radio Astronomy

Scientific paper

The identification of interstellar molecular species via the detection of one spectral line has recently become subject to close scrutiny. The radical HNO falls into the class of interstellar molecules identified in this manner. To corroborate this identification, observation of additional spectral lines is necessary. In this paper, laboratory millimeter and submillimeter wave spectra of both HNO and DNO are reported in the frequency region 150-500 GHz. Based on these spectral line measurements, models for HNO and DNO have been constructed to yield accurate frequencies for all rotational transitions of these species below 500 GHz involving J values smaller than 10. The spectral lines can be utilized by radio astronomers to confirm the identification of interstellar HNO and to search for interstellar DNO.

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