Energy distributions of clusters cooled by thermal radiation
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Particles that cool radiatively in vacuum reach a limiting energy distribution, defined by the low energy dielectric function, the heat capacity and time. We find that in a finite time, both mean temperature and the width of the distribution converge to powerlaws in time, and that the ratio of the two reach a constant value which depends on the heat capacity and the photon absorption cross section. Further, both the photon emission rate and the ratio of width to mean energy of the distribution show surprising similarities with the analogous results for cooling by particle evaporation.
PACS.36.40.-c Atomic and molecular clusters 61.46.Bc Clusters 61.46.Df Nanoparticles
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