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Positron state and Lifetime in C60/C70 Fullerites

Published online by Cambridge University Press:  25 February 2011

H.-E. Schaefer ,
M. Forster ,
R. WÜrschum  and
F. Banhart
H.-E. Schaefer
Affiliation:
Universität Stuttgart, Institut für Theoretische und Angewandte Physik, PfafFenwaldring 57, 7000 Stuttgart 80, Germany
M. Forster
Affiliation:
Universität Stuttgart, Institut für Theoretische und Angewandte Physik, PfafFenwaldring 57, 7000 Stuttgart 80, Germany
R. WÜrschum
Affiliation:
Universität Stuttgart, Institut für Theoretische und Angewandte Physik, PfafFenwaldring 57, 7000 Stuttgart 80, Germany presently at: Massachusetts Institute of Technology, Dep. Materials Science and Engin., Cambridge, MA 02139, USA
F. Banhart
Affiliation:
Max-Planck-Institut für Metallforschung, Institut fur Physik, Heisenbergstr. 1, 7000 Stuttgart 80, Germany
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Abstract

The present paper reports on positron lifetime measurements on Ceo/C 70 fullerite powder as a function of temperature and quasi-hydrostatic pressure in order to give an estimate of the positron annihilation site in the fullerite lattice. A single-component positron lifetime of 402 ps is observed which significantly decreases under quasi-hydrostatic pressure. From this and the soft intermolecular properties of the fullerites one can conclude that the positron is annihilated rather in the intermolecular space than inside the fullerene molecules. However, positron trapping at lattice defects, which are observed by high-resolution electron microscopy, cannot be ruled out.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 270: Symposium M – Novel Forms of Carbon , 1992 , 311
Copyright
Copyright © Materials Research Society 1992

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References

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