Radiative cooling of polyyne anions: C4Hand C6H

Author:

Zhu Boxing1ORCID,Bull James N.2ORCID,Navarro Navarrete José E.1ORCID,Schmidt-May Alice F.1ORCID,Cederquist Henrik1ORCID,Schmidt Henning T.1ORCID,Zettergren Henning1ORCID,Stockett Mark H.1ORCID

Affiliation:

1. Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden

2. School of Chemistry, Norwich Research Park, University of East Anglia, Norwich NR4 7TJ, United Kingdom

Abstract

Time-dependent photodetachment action spectra for the linear hydrocarbon anions C4Hand C6Hare 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 C4Hand 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.

Funder

Vetenskapsrådet

Stiftelsen Olle Engkvist Byggmästare

Swedish Foundation for International Cooperation in Research and Higher Education

Publisher

AIP Publishing

Subject

Physical and Theoretical Chemistry,General Physics and Astronomy

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