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Study of Linear and Nonlinear Microscopic Polarizabilities of C60

Published online by Cambridge University Press:  25 February 2011

Erik Westin  and
Arne RosÉn
Erik Westin
Affiliation:
Department of Physics, Chalmers University of Technology and University of Göteborg, S–412 96 Göteborg, Sweden
Arne RosÉn
Affiliation:
Department of Physics, Chalmers University of Technology and University of Göteborg, S–412 96 Göteborg, Sweden
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Abstract

The low energy part of the linear optical response spectrum and lowest order hyperpolarizability γ(3) of C60 are calculated by a sum over state approach using single particle wavefunctions and. energy levels determined from local density calculations. Lorentz local field factors, as well as a RPA correction are introducedto facilitate comparison with the dielectric function ε(ω) determined fromfilms of C60. γ( 2 ) for a centrosymmetric molecule such asC60 is zero and the lowest non-zero contribution to the polarizability is γ( 3 ). Reasonable agreement is found with linear optical response experiments if a RPA screening is used. However, SHG and THG experiments on C60 in solid or solution form, yields values closer to the unscreened results.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 270: Symposium M – Novel Forms of Carbon , 1992 , 221
Copyright
Copyright © Materials Research Society 1992

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References

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