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Influence of thermal radiation on hot cluster decay rates and abundances

Journal article
Authors Klavs Hansen
Piero Ferrari
Published in Chinese Journal of Chemical Physics
Volume 32
Issue 2
Pages 167-174
ISSN 1674-0068
Publication year 2019
Published at Department of Physics (GU)
Pages 167-174
Language en
Links doi.org/ 10.1063/1674-0068/cjcp1812...
Keywords Thermal radiation, clusters, nanoparticles
Subject categories Physical Chemistry, Atom and Molecular Physics and Optics

Abstract

The influence of radiative cooling on the unimolecular decay rates of free, hot clusters and molecules with unspecified excitation energies is quantified. Two different regimes, defined by the magnitude of the energy of the photons emitted, are identified and the boundary between them is given. The boundary is determined in terms of the photon emission rate constants and thermal properties of the particles. Also the abundance spectra are calculated for the continuous cooling case, corresponding to small photon energies. The two regimes correspond to continuous cooling and single photon quenching of the unimolecular decay. The radiative effect can be parametrized by a redefinition of the time each individual cluster has available to undergo evaporation, expressed by an effective radiative time constant.

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