The comet-tail (A 2Πi–X 2Σ+) system of 13C18O+

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Abstract
The comet‐tail (A2Πi–X2Σ+) system of the molecular ion 13C18O+, excited in the cathode glow of a hollow‐cathode discharge tube, was recorded in the spectral region 3620–6165 Å. Of the nine bands observed with v’=0 to 5 and v‘=0 to 2, the rotational structure of 8 bands was analyzed. Brown’s effective Hamiltonian [J. M. Brown, E. A. Colbourn, J. K. G. Watson, and F. D. Wayne, J. Mol. Spectrosc. 7 4, 294 (1979)] was used to obtain the molecular constants of the individual bands from their wave number data. By ‘‘merging’’ the molecular constants thus obtained, a unique set of constants for the X2Σ+ and A2Πi states was obtained. Some of the derived molecular constants of 13C18O+ in units of cm−1 (except re in Å) are: X2Σ+: Be=1.794 28(5), re=1.1156, αe=0.016 66(3), ΔG(1/2)=2082.69; A2Πi: Be=1.441 73(5), re=1.2445, αe=0.016 71(1), ωe=1488.07, ωexe=12.16.