Electronic Spectra of the Triacetylene Cation (HC6H+) and Protonated Triacetylene (HC6H2+) Tagged with Ar
Ugo Jacovella A , Giel Muller B , Katherine J. Catani A , Nastasia I. Bartlett A and Evan J. Bieske A C
+ Author Affiliations
- Author Affiliations
A School of Chemistry, University of Melbourne, Parkville, Vic. 3010, Australia.
B Department of Chemical Engineering, University of Melbourne, Parkville, Vic. 3010, Australia.
C Corresponding author. Email: evanjb@unimelb.edu.au
Australian Journal of Chemistry 72(4) 260-266 https://doi.org/10.1071/CH18508
Submitted: 15 October 2018 Accepted: 5 December 2018 Published: 21 December 2018
Abstract
Polyacetylene cations (HC2nH+) play important roles in combustion processes and in the chemistry of planetary atmospheres and interstellar clouds. Here we report the electronic spectrum for the triacetylene cation (HC6H+) recorded over the 300–610 nm range by photodissociating mass-selected ions tagged with argon atoms in a tandem mass spectrometer. The spectrum shows three band systems that are assigned to 
(origin transition 16 665 cm−1), 
(origin transition 23 916 cm−1), and 
(origin transition 29 920 cm−1). Although the 
band system is well known, the 
and 
band systems are observed for the first time in the gas phase. In addition, the 
electronic spectrum of the protonated triacteylene cation tagged with an argon atom (HC6
-Ar) is reported, providing the first gas-phase spectrum for this species.
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