Millimeter and submillimeter rest frequencies for the MgF radical

Details Millimeter and submillimeter rest frequencies for the MgF radical Millimeter and submillimeter rest frequencies for the MgF radical

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...425l..53a&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 425, no. 1, p. L53-L57

Astronomy and Astrophysics

Astrophysics

9

Absorption Spectra, Fine Structure, Fluorine Isotopes, Magnesium Fluorides, Magnesium Isotopes, Molecular Spectra, Molecular Spectroscopy, Rotational States, Aluminum Fluorides, Carbon Stars, Extremely High Frequencies, Interstellar Matter, Millimeter Waves, Submillimeter Waves

Scientific paper

The pure rotational spectrum of the MgF radical in its ground X2 Sigma(+) electronic state has been observed in the laboratory using millimeter/submillimeter direct absorption spectroscopy. Rotational transitions arising from the v = 0, 1, 2, and 3 vibrational modes of the main magnesium isotopic species, (24)MgF, have been recorded, as well as those arising from the v = 0 state of the Mg-25 and Mg-26 isotopomers. Rotational and fine-structure constants have been determined for these molecules, as well as hyperfine parameters for both the F-19 (I = 1/2) and Mg-25 (I = 5/2) nuclei. The rest frequencies presented here for MgF have an estimated accuracy of +/- 200 kHz, and will enable astronomical searches to be carried out for this fluoride radical. Magnesium fluoride may be present in the late-type carbon star IRC +10216, where AlF appears to be abundant.

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