Radiative cooling of polyyne anions: C4H- and C6H-

被引：3
|
作者：
Zhu, Boxing [1 ]
Bull, James N. N. [2 ]
Navarrete, Jose E. Navarro [1 ]
Schmidt-May, Alice F. F. [1 ]
Cederquist, Henrik [1 ]
Schmidt, Henning T. T. [1 ]
Zettergren, Henning [1 ]
Stockett, Mark H. H. [1 ]
机构：
[1] Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden
[2] Univ East Anglia, Norwich Res Pk, Sch Chem, Norwich NR4 7TJ, England
来源：
JOURNAL OF CHEMICAL PHYSICS | 2022年 / 157卷 / 17期
基金：
瑞典研究理事会;
关键词：
ASTRONOMICAL IDENTIFICATION; NEGATIVE-IONS; INTERSTELLAR; CHEMISTRY; CLOUDS;
D O I：
10.1063/5.0111144
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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 & PLUSMN; 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.
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页数：7
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