Laboratory studies of the HNCO molecular spectrum for precise spectroscopy of dark clouds

Astronomy Letters - 2007
A. V. Lapinov1, G. Yu. Golubiatnikov1, V. N. Markov1, A. Guarnieri2
1Institute of Applied Physics, Russian Academy of Sciences, Nizhni Novgorod, Russia
2Technical Faculty, Christian-Albrechts University, Kiel, Germany

Tóm tắt

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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Astronomy Letters

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