The millimeter-wave spectrum of the CaF radical (X2Sigma(+))

Details The millimeter-wave spectrum of the CaF radical (X2Sigma(+)) The millimeter-wave spectrum of the CaF radical (X2Sigma(+))

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424..503a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004- 637X), vol. 424, no. 1, March 20, 1994, p. 503-506

Astronomy and Astrophysics

Astrophysics

10

Absorption Spectroscopy, Calcium Fluorides, Interstellar Matter, Millimeter Waves, Rotational Spectra, Abundance, Nuclear Spin

Scientific paper

The pure rotational spectrum of the CaF radical has been measured in the laboratory using millimeter/sub-mm direct absorption spectroscopy. Fourteen rotational transitions have been detected originating in the v = 0 mode of the species. Rotational lines of the vibrationally excited v = 1, 2, and 3 states have also been observed. Spin-rotation splittings, as well as hyperfine interactions arising from the nuclear spin of the fluorine atom, were resolved in the CaF spectra. Rotational, fine-structure, and in some cases, hyperfine parameters were determined for the various vibrational modes of the molecule from a nonlinear least-squares fit to the data, using a 2Sigma Hamiltonian, and are in agreement with past measurements. The newly measured rest frequencies for CaF, which are accurate to at least + or - 100 kHz, will enable astronomical searches to be conducted for the molecule in interstellar and circumstellar gas. Given the recent detection of AlF in IRC + 10216, metal fluoride species may be more abundant than previously thought.

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