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Identification of interstellar X-ogen as HCO/+/
Kraemer, W. P.; Diercksen, G. H. F.
AA(Max-Planck-Institut für Physik und Astrophysik, Munich, Germany), AB(Max-Planck-Institut für Physik und Astrophysik, Munich, Germany)
Astrophysical Journal, vol. 205, Apr. 15, 1976, pt. 2, p. L97-L100. (ApJL Homepage)
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NASA/STI Keywords:
Interstellar Matter, Line Spectra, Molecular Spectra, Hydrocyanic Acid, Molecular Ions, Molecular Rotation, Spectrum Analysis, Tables (Data)
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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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