Radiative stabilization of the indenyl cation: Recurrent fluorescence in a closed-shell polycyclic aromatic hydrocarbon

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Bull, James N., Subramani, Arun, Liu, Chang, Marlton, Samuel J. P., Ashworth, Eleanor K., Cederquist, Henrik, Zettergren, Henning and Stockett, Mark H. (2025) Radiative stabilization of the indenyl cation: Recurrent fluorescence in a closed-shell polycyclic aromatic hydrocarbon. Physical Review Letters, 134 (22). ISSN 0031-9007

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Abstract

Several small polycyclic aromatic hydrocarbons (PAHs) with closed-shell electronic structure have been identified in the cold, dark environment Taurus Molecular Cloud 1. We measure efficient radiative cooling through the combination of recurrent fluorescence (RF) and IR emission in the closed-shell indenyl cation (C9⁢H+7), finding good agreement with a master equation model including molecular dynamics trajectories to describe internal-energy-dependent properties for RF. We find that C9⁢H+7 formed with up to =5.85 eV vibrational energy, which is ≈2 eV above the dissociation threshold, radiatively cool rather than dissociate. The efficient radiative stabilization dynamics are likely common to other closed-shell PAHs present in space, contributing to their abundance.

Item Type:	Article
Additional Information:	Funding information: Funding was provided by the Swedish Foundation for International Cooperation in Research and Higher Education (STINT) Grant for Internationalization program (PT2017-7328), an EPSRC New Investigator Award (EP/W018691), the Knut and Alice Wallenberg Foundation (2018.0028, Probing charge and mass-transfer reactions on the atomic level), and the Swedish Research Council (Contract No. 2019-04379, No. 2018-04092, No. 2020-03437, and No. 2023-03833).
Faculty \ School:	Faculty of Science > School of Chemistry, Pharmacy and Pharmacology Faculty of Science
UEA Research Groups:	Faculty of Science > Research Groups > Centre for Photonics and Quantum Science Faculty of Science > Research Groups > Chemistry of Light and Energy
Related URLs:	http://www.scopus.com/inward/record.url?... https://link.aps.org/doi/10.1103/PhysRev...
Depositing User:	LivePure Connector
Date Deposited:	09 Jun 2025 15:30
Last Modified:	22 Jun 2025 00:25
URI:	https://ueaeprints.uea.ac.uk/id/eprint/99410
DOI:	10.1103/PhysRevLett.134.228002

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