Radiative cooling of polyyne anions: C4H- and C6H-

Boxing Zhu, James N. Bull, Jose E. Navarro Navarrete, Alice Frederike Schmidt-May, Henrik Cederquist, Henning T. Schmidt, Henning Zettergren, Mark H. Stockett

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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.

Original languageEnglish
Article number174308
JournalThe Journal of Chemical Physics
Volume157
Issue number17
Early online date7 Oct 2022
DOIs
Publication statusPublished - 1 Nov 2022

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