Radiative cooling of fullerene anions in a storage ring |
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| Authors: | JU Andersen C Gottrup K Hansen P Hvelplund MO Larsson |
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| Institution: | (1) Institute of Physics and Astronomy, University of Aarhus, 8000 Aarhus, Denmark, DK |
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| Abstract: | Thermionic emission from hot fullerene anions, CN
-, has been measured in an electrostatic storage ring for even N values from 36 to 96. The decay is quenched by radiative cooling and hence the observations give information on the intensity
of thermal radiation from fullerenes. The experiments are analysed by comparison with a simulation which includes the quantisation
of photon energy and the statistics of emission. Experiments with heating of the molecules with a laser beam confirm the interpretation
of the observations in terms of radiative cooling and give an independent estimate of the cooling rate for C60
-. The measured cooling rates agree in general within a factor of two with the prediction from a classical dielectric model
of a thermal radiation intensity of ∼ 300 eV/s for C60 at 1 400 K, scaling approximately with the 6th power of the temperature and with the number of atoms in the molecule.
Received 12 March 2001 and Received in final form 12 June 2001 |
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| Keywords: | PACS 36 40 -c Atomic and molecular clusters – 36 40 Cg Electronic and magnetic properties of clusters – 36 40 Qv Stability and fragmentation of clusters – 36 40 Wa Charged clusters – 39 10 +j Atomic and molecular beam sources and techniques |
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