Identification of interstellar X-ogen as HCO/+/

Details Identification of interstellar X-ogen as HCO/+/ Identification of interstellar X-ogen as HCO/+/

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...205l..97k&link_type=abstract

Astrophysical Journal, vol. 205, Apr. 15, 1976, pt. 2, p. L97-L100.

Astronomy and Astrophysics

Astrophysics

28

Interstellar Matter, Line Spectra, Molecular Spectra, Hydrocyanic Acid, Molecular Ions, Molecular Rotation, Spectrum Analysis, Tables (Data)

Scientific paper

An attempt is made to identify the interstellar X-ogen line at 89.19 GHz by improving vacuum-chemical results for the geometrical structure of the HCO(+) molecular ion. The energy hypersurface in the minimum region is determined for HCO(+) and HCN by using the self-consistent-field and configuration-interaction approaches. Molecular force constants through fourth order are obtained from a polynomial fit of the ab initio energy hypersurfaces, and the rotational as well as the rotation-vibration constants of the two species are reevaluated. The resulting rotational-transition frequencies are found to reproduce the isotopic HCN lines quite well and to match the X-ogen line exactly. Based on this analysis, the interstellar X-ogen line at 89.19 GHZ is identified as the lowest rotational transition (J l - 0) of the HCO(+) molecular ion.

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