Rotationally resolved electronic spectroscopy of a nonlinear carbon chain radical C6H4 |
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Authors: | Dmitriy Khoroshev Przemyslaw Kolek Petre Birza Andrei Chirokolava John P Maier |
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Institution: | Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland |
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Abstract: | Rotationally resolved electronic spectrum of the origin band in the 2A″-X2A″ transition of a nonlinear carbon chain radical C6H4+ has been recorded in the 604 nm region using cw cavity ring down spectroscopy. The radical was produced by a discharge through an acetylene-helium mixture in a supersonic planar expansion. The rotational structure has been analysed and precisely determined. A band having a-type prolate rotational structure has also been observed near 581 nm. By considering the results of ab initio calculations this band is assigned to a transition involving the excitation of the ν12 fundamental in the upper 2A″ electronic state of the same C6H4+ isomer. |
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Keywords: | Nonlinear carbon chain C6H4+ Cavity ring down Rotational constant |
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