Radiative Stabilization of the Indenyl Cation: Recurrent Fluorescence in a Closed-Shell Polycyclic Aromatic Hydrocarbon

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 (C_{9}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 C_{9}H_{7}^{+} formed with up to E_{c}=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.

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Publication Details

Journal
Physical Review Letters
Published
2025-06-06
DOI
https://doi.org/10.1103/physrevlett.134.228002
Citations
8
Primary Topic
Photochemistry and Electron Transfer Studies
Type
article
Field-Weighted Citation Impact
14.02

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article

Radiative Stabilization of the Indenyl Cation: Recurrent Fluorescence in a Closed-Shell Polycyclic Aromatic Hydrocarbon

Samuel J. P. Marlton, Eleanor K. Ashworth, H. Cederquist, Arun Subramani et al.
8 citations
Physical Review Letters
Photochemistry and Electron Transfer Studies
14.02
article

Radiative Stabilization of the Indenyl Cation: Recurrent Fluorescence in a Closed-Shell Polycyclic Aromatic Hydrocarbon

Samuel J. P. Marlton, Eleanor K. Ashworth, H. Cederquist, Arun Subramani, James N. Bull, Henning Zettergren, Mark H. Stockett, Chang Liu
article en
8 citations

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 (C_{9}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 C_{9}H_{7}^{+} formed with up to E_{c}=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.

Physical Review LettersVol. 134(22)
University of East Anglia (GB), Stockholm University (SE), The University of Melbourne (AU)
University of East Anglia, European Cooperation in Science and Technology, Swedish Foundation for International Cooperation in Research and Higher Education, Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, Engineering and Physical Sciences Research Council
Openalex Percentile: Top 1%
Photochemistry and Electron Transfer Studies
14.02
DOIOpen Access PDFOpenAlex
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