New Observations of the Optical Spectrum of SiO + and the Prediction of Its Rotational Spectrum

Details New Observations of the Optical Spectrum of SiO + and the Prediction of Its Rotational Spectrum New Observations of the Optical Spectrum of SiO + and the Prediction of Its Rotational Spectrum

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...418..307z&link_type=abstract

Astrophysical Journal v.418, p.307

Astronomy and Astrophysics

Astronomy

13

Ism: Molecules, Molecular Data, Techniques: Spectroscopic

Scientific paper

The (0, 0) and (1, 0) bands of the B2Σ+-Χ2Σ+ system of 28Si16O+ have been observed with very high resolution using the technique of laser-induced fluorescence from a mass-selected fast ion beam. The data yield values of the υ" = 0 rotational and fine-structure constants with an improvement in precision by about an order of magnitude over earlier work. This makes it possible to predict the frequencies of pure rotational transitions within this vibrational level at a level of precision that allows unambiguous comparison with molecular lines observed in interstellar clouds. In particular, the transition (J = 5/2, N = 2) → (J = 3/2, N = 1), which has been considered as the source of the observed U86.2 line at 86,243.45(40) MHz, is predicted to occur at 86,037(6) MHz.

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