Laboratory studies of the HNCO molecular spectrum for precise spectroscopy of dark clouds |
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Authors: | A V Lapinov G Yu Golubiatnikov V N Markov A Guarnieri |
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Institution: | (1) Institute of Applied Physics, Russian Academy of Sciences, ul. Ul’yanova 46, Nizhni Novgorod, 603950, Russia;(2) Technical Faculty, Christian-Albrechts University, Kiel, Germany |
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Abstract: | Detailed studies of the internal motions of dark clouds using spectral lines of many molecules require a laboratory frequency accuracy of the order of a few m s?1. Based on our laboratory studies of the HNCO rotational spectrum in the ground vibrational state, we have increased significantly the accuracy of frequency calculation in a wide range of quantum numbers. We have achieved an (1σ) uncertainty for rotational transitions in the K a = 0, 1 states recalculated to the Doppler velocity scale ≤2 m s?1 for all frequencies <1.1 THz. This value allows radio-astronomical measurements with an accuracy comparable to that of the highest-precision observations based on spectral lines of other molecules. |
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Keywords: | interstellar medium— dark clouds molecular data— rotational constants microwave spectrum— laboratory frequencies |
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