Kinetics of radiation cooling of fullerenes |
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Authors: | A A Vostrikov A A Agarkov D Yu Dubov |
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Institution: | (1) Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia |
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Abstract: | Emission from fullerene molecules excited by means of electron impact in crossed beams under conditions of single collisions
between electrons and C60 molecules in a kinetic energy range E
e
from 25 to 100 eV was studied experimentally. Emission spectra in a wavelength range from 300 to 800 nm; the emission excitation
functions and the temperature of emitting molecules as a function of E
e
were measured with a resolution of 1.6–3.2 nm. The contribution to emission from ionized C
60
+*
molecules has been determined and data on the emissivity of the C
60
+*
ion have been obtained. It has been shown that the emission spectra can be well approximated with the spectral distribution
of thermal emission from a black body (Planck’s formula), taking into account the lowering of emissivity for a small particle.
The emission can be observed starting with electron energy of about 27 eV; the emission excitation function is of a nonresonant
form, peaking at an energy of E
e
≈70 eV. As E
e
is increased, the temperature of emitting particles rises and reaches its maximum value of 3100–3200 K at E
e
≈47 eV. |
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Keywords: | |
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