AI Article Synopsis
- The study investigates the cooling characteristics of linear hydrocarbon anions CH and CH using a specialized cryogenic experiment that monitors their photodetachment action spectra.
- The average cooling rates for these ions were measured and found to be 19 ± 2 seconds for CH and 3.0 ± 0.2 seconds for CH, using a technique called Non-negative Matrix Factorization.
- The cooling dynamics observed provide valuable insights for understanding the thermal properties of these anions and improving models related to their behavior in astrochemical settings.
Article Abstract
Time-dependent photodetachment action spectra for the linear hydrocarbon anions CH and CH 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 CH and CH, 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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| http://dx.doi.org/10.1063/5.0111144 | DOI Listing |
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