We modeled observations of the C2 d3Πg–a3Πu (Swan) Δν = 0 sequence observed in spectra of comet 122P/de Vico obtained with the 2.7 m Harlan J. Smith Telescope and Tull Coude spectrograph of McDonald observatory on 10/3/1995 and 10/4/1995. The data used spanned 4986–5169 Å at R = λ/Δλ = 60 000. We used the PGOPHER molecular spectra model to generate and fit synthetic spectra with the d3Πg having one and two rotational temperatures. We found that the excited state had a two-component rotational temperature, similar to that found for comet Halley. The modeled spectrum was sufficiently high quality that local perturbations were important to include. The large perturbation, b3Σg–(ν = 10), was added to our fits, and some new estimates of its molecular constants were found.
Bibliographical notePublished as part of The Journal of Physical Chemistry virtual special issue “William M. Jackson Festschrift”.
Nelson, T., Cochran, A. L., & Western, C. (2018). Rotational Temperature Modeling of the Swan Δν = 0 Band Sequence in Comet 122P/de Vico. Journal of Physical Chemistry A, 122(40), 8020-8025. https://doi.org/10.1021/acs.jpca.8b07441