Isotope and Temperature Effects on the Electronic Spectra of Large Carbonaceous Molecular Ions of Interstellar Relevance
Ewen K. Campbell A B C , Corey A. Rice A , Francois X. Hardy A and John P. Maier A
+ Author Affiliations
- Author Affiliations
A Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland.
B Present address: School of Chemistry, University of Edinburgh, Joseph Black Building, Kings Buildings, David Brewster Road, Edinburgh, EH9 3FJ, UK.
C Corresponding author. Email: e.k.campbell@ed.ac.uk
Australian Journal of Chemistry 72(11) 856-859 https://doi.org/10.1071/CH19206
Submitted: 7 May 2019 Accepted: 17 June 2019 Published: 23 July 2019
Abstract
The electronic spectra of isotopologues of protonated coronene in the gas phase were measured at a vibrational and rotational temperature of ~10 K in a 22-pole ion trap. The (1) 1A′←X 1A′ transition of these polycyclic aromatic hydrocarbon cations with one to three carbon-13 have origin band maxima that blue-shift successively by 0.03 nm. All isotopologues show distinct vibrational structure in the (1) 1A′ state. These results are compared with the effect of 13C substitution on the near infrared electronic absorptions of C60+. The (1) 1A←X 1A electronic transition of monodeuterated coronene was also recorded and its origin band is red-shifted to that of protonated coronene by 0.8 nm. The implications for astronomical observations are considered.
References
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