Precise Laboratory Frequencies for the J = 1-0 and J = 2-1 Rotational Transitions of C18O

Details Precise Laboratory Frequencies for the J = 1-0 and J = 2-1 Rotational Transitions of C18O Precise Laboratory Frequencies for the J = 1-0 and J = 2-1 Rotational Transitions of C18O

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...592l..95c&link_type=abstract

The Astrophysical Journal, Volume 592, Issue 2, pp. L95-L98.

Astronomy and Astrophysics

Astronomy

19

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

Scientific paper

Precise rest frequencies for the J=1-0 and J=2-1 rotational transitions of C18O have been measured in the laboratory using the Lamb-dip technique with an accuracy better than 1 kHz (2 σ uncertainty). In contrast to the main CO isotopomer, interstellar C18O lines are significantly narrower and very often have Gaussian line shapes. Taking into account their relatively high intensities in interstellar clouds, the new laboratory measurements allow us to consider C18O as the best frequency standard in radio astronomical spectroscopy.

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