The comet-tail (A-X) system of CO(+) - Precise molecular constants of its 2Sigma(+), A 2 Pii, and B 2Sigma(+) states

Details The comet-tail (A-X) system of CO(+) - Precise molecular constants of its 2Sigma(+), A 2 Pii, and B 2Sigma(+) states The comet-tail (A-X) system of CO(+) - Precise molecular constants of its 2Sigma(+), A 2 Pii, and B 2Sigma(+) states

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...388..669h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 388, April 1, 1992, p. 669-677.

Astronomy and Astrophysics

Astrophysics

19

Carbon Monoxide, Comet Tails, Electron States, Molecular Ions, Positive Ions, Cathode Glow, Ground State, Hollow Cathodes, Infrared Spectra, Microwave Spectra

Scientific paper

The comet-tail (A 2 Pii-X 2Sigma(+)) system of the molecular ion (C-12)(O-16)(+), excited in the cathode glow of a hollow-cathode discharge tube of special design, was photographed in the spectral region 3400-8500 A. Of the 17 observed bands with v-prime = 0-8 and v-double prime = 0-4, the rotational structure of 12 bands with v-prime = 0-4 and 6 and v-double prime = 0-4 was analyzed. An effective Hamiltonian was used to obtain the molecular constants of the individual bands from their wavenumber data and the constants for the A and X states were then determined by merging the molecular constants thus obtained by the method of correlated least-squares fit. Recent experimental data of (C-12)(O-16)(+) available for the first negative (B 2Sigma(+)-X 2Sigma(+)) and the Baldet-Johnson (B 2Sigma(+)-A 2Pii) systems and for the IR spectrum involving v = 0 and 1, and the microwave spectra involving v = 0, 1, and 2, of its ground state X, were reanalyzed using this effective Hamiltonian. A precise set of molecular constants for the X, A, and B states of (C-12)(O-16)(+) is determined by the procedures referred to above. The astrophysical importance of the spectra of CO(+) is also briefly outlined.

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