Radiative cooling of polyyne anions: C4H- and C6H-

Zhu, Boxing, Bull, James N. ORCID: https://orcid.org/0000-0003-0953-1716, Navarro Navarrete, Jose E., Schmidt-May, Alice Frederike, Cederquist, Henrik, Schmidt, Henning T., Zettergren, Henning and Stockett, Mark H. (2022) Radiative cooling of polyyne anions: C4H- and C6H-. The Journal of Chemical Physics, 157 (17). ISSN 0021-9606

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Abstract

Time-dependent photodetachment action spectra for the linear hydrocarbon anions C4H- and C6H- are investigated using the cryogenic Double ElectroStatic Ion Ring ExpEriment. The radiative cooling characteristics of these ions on the millisecond to seconds timescale are characterized by monitoring changes in their spectra as the ions cool by spontaneous infrared (IR) emission. The average cooling rates, extracted using Non-negative Matrix Factorization, are fit with 1/e lifetimes of 19 ± 2 and 3.0 ± 0.2 s for C4H- and C6H-, respectively. The cooling rates are successfully reproduced using a simple harmonic cascade model of IR emission. The ultraslow radiative cooling dynamics determined in this work provide important data for understanding the thermal cooling properties of linear hydrocarbon anions and for refining models of the formation and destruction mechanisms of these anions in astrochemical environments.

Item Type: Article
Additional Information: Acknowledgements: The authors wish to acknowledge the support of the Swedish Research Council (Grant Nos. 2016-03675, 2016-04181, and 2020-03437), the Olle Engkvist Foundation (Grant No. 200-575), the project grant “Probing charge- and mass–transfer reactions on the atomic level” (Grant No. 2018.0028) from the Knut and Alice Wallenberg Foundation, and the Swedish Foundation for International Collaboration in Research and Higher Education (STINT, Grant No. PT2017-7328 awarded to J.N.B. and M.H.S.). This work was performed at the Swedish National Infrastructure, DESIREE (Swedish Research Council Contract Nos. 2017-00621 and 2021-00155). The authors also thank the DESIREE technical staff for their invaluable assistance during the whole experiment.
Uncontrolled Keywords: physics and astronomy(all),physical and theoretical chemistry ,/dk/atira/pure/subjectarea/asjc/3100
Faculty \ School: Faculty of Science > School of Chemistry
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Depositing User: LivePure Connector
Date Deposited: 10 Oct 2022 13:31
Last Modified: 15 Dec 2022 03:38
URI: https://ueaeprints.uea.ac.uk/id/eprint/88929
DOI: 10.1063/5.0111144

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