Inelastic Interaction of an Electron with a C60 Cluster |
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| Authors: | A A Vostrikov D Yu Dubnov A A Agarkov |
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| Affiliation: | (1) Institute of Thermophysics, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090, Russia |
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| Abstract: | The method of intersecting beams of C60 fullerene clusters and of electrons is used to investigate the production of C
60
+
and C
60
–
ions and the radiation in the wavelength range from 300 to 800 nm for the electron energy E
e
ranging from zero to 100 eV. The absolute values of the ionization and electron-attachment cross sections  +(E
e
) and –(E
e
), respectively] are determined. A maximum of +(E
e
) of 0.53 nm2is observed at E
e
= 52 eV. For a C60 cluster excited by electron impact,  delayed ( 150  s) ionization initiated by collision with the surface and ionization due to thermionic emission (its characteristic time at E
e
= 60 eV is 6 s) is observed. It is found that, for E
e
< 0.4 eV, the formation of C
60
–
is defined by the polarization capture of an s-electron (– E
e
–1
), and a formula is suggested for determining –(E
e
). In the region of E
e
from 1 to 6 eV, the cross section –(E
e
) shows only slight variations about –(E
e
) = 0.36 ± 0.03 nm2. For E
e
> 7.5 eV, C
60
–
ions proved to be unstable to electron autodetachment. In the region of intersection of C60 and electron beams, radiation of a quasicontinuous spectrum described by a modified Planck formula for the thermal emission of spherical particles of diameter d   is recorded. For E
e
> 47 eV, the brightness temperature proved to be 3150 ± 50 K. It is found that this radiation is emitted predominantly by hot C
60
+*
ions produced as a result of thermionic emission from C
60
*
. The rate of radiation loss of energy by a C
60
+*
ion and the cross section for the formation of radiating C
60
+*
ions are found to be, respectively, 5.5 × 105 eV/s at T = 3150 K and 2 × 10–2 nm2 at E
e
= 60 eV. |
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| Keywords: | |
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