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Rotational Temperature Modeling of the Swan Δν = 0 Band Sequence in Comet 122P/de Vico

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Original languageEnglish
Pages (from-to)8020-8025
Number of pages6
JournalJournal of Physical Chemistry A
Issue number40
Early online date17 Sep 2018
DateAccepted/In press - 17 Sep 2018
DateE-pub ahead of print - 17 Sep 2018
DatePublished (current) - 11 Oct 2018


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.

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Published as part of The Journal of Physical Chemistry virtual special issue “William M. Jackson Festschrift”.

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