Precise Laboratory Frequencies for the J<--J-1 (J=1, 2, 3, 4) Rotational Transitions of 13CO

Details Precise Laboratory Frequencies for the J<--J-1 (J=1, 2, 3, 4) Rotational Transitions of 13CO Precise Laboratory Frequencies for the J<--J-1 (J=1, 2, 3, 4) Rotational Transitions of 13CO

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...611..615c&link_type=abstract

The Astrophysical Journal, Volume 611, Issue 1, pp. 615-620.

Astronomy and Astrophysics

Astronomy

9

Ism: Molecules, Methods: Laboratory, Molecular Data, Radio Lines: Ism

Scientific paper

Precise rest frequencies for the first four rotational transitions of 13CO have been measured in the laboratory using the Lamb-dip technique with an accuracy better than 1 kHz. Taking into account available frequencies for the higher J transitions, the new measurements allowed us to predict rotational transitions up to 1 THz with 2 σ<=1 m s-1 in a Doppler velocity scale. We found that the hyperfine (hf) splitting constant due to 13C magnetic spin-rotation interaction, estimated from Lamb-dip measurements, is in excellent agreement with the results from molecular-beam experiments. In contrast to recent studies, no rotational dependence on the J quantum number has been determined with significantly high accuracy. Since hf splitting is comparable to the thermal line broadening at Tk=10 K, its analysis can be important for 13CO observations in dark clouds without nonthermal broadening.

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