Spectroscopy And Astrochemistry Of The Cn-tagged Cyclic Hydrocarbons Cyanocyclopentadiene And Cyanoindene
Changala, Bryan
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https://hdl.handle.net/2142/116529
Description
Title
Spectroscopy And Astrochemistry Of The Cn-tagged Cyclic Hydrocarbons Cyanocyclopentadiene And Cyanoindene
Author(s)
Changala, Bryan
Contributor(s)
McGuire, Brett A.
McCarthy, Michael C.
Charnley, Steven B.
Cordiner, Martin
Cooke, Ilsa Rose
Xue, Ci
Burkhardt, Andrew M.
Loomis, Ryan A.
Lee, Kelvin
Issue Date
2022-06-24
Keyword(s)
Astronomy
Abstract
The weak, often vanishing, dipole moments of polycyclic aromatic hydrocarbons pose a challenge to exploring their interstellar chemistry through radio astronomy. Funtionalization of a pure hydrocarbon with a highly polar nitrile ($-$CN) group yields a useful proxy, so long as the spectroscopy and chemistry of such CN-tagged molecules are well understood. In this talk, we present recent laboratory measurements of the CN-substituted cyclic hydrocarbons cyanocyclopentadiene, C$_5$H$_5$CN, and cyanoindene, C$_9$H$_7$CN, produced in a discharge expansion source and probed by cavity-enhanced Fourier transform microwave spectroscopy. We discuss the role that resonantly stabilized radical intermediates play in the likely formation chemistry of these species and the astrochemical implications of their abundances in the cold, dense molecular cloud TMC-1.
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