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Time-Resolved X-Ray Absorption of An Amorphous Si Foil During Pulsed Laser Irradiation

Published online by Cambridge University Press:  26 February 2011

Kouichi Murakami ,
Hans C. Gerritsen ,
Hedser Van Brug ,
Fred Bijkerk ,
Frans W. Saris  and
Marnix J. Van Der Wiel
Kouichi Murakami
Affiliation:
FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.
Hans C. Gerritsen
Affiliation:
FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.
Hedser Van Brug
Affiliation:
FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.
Fred Bijkerk
Affiliation:
FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.
Frans W. Saris
Affiliation:
FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.
Marnix J. Van Der Wiel
Affiliation:
FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.
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Abstract

We report time-resolved X-ray absorption and extended X-ray absorption fine structure (EXAFS) measurements on amorphous silicon under nanosecond pulsed-laser irradiation. Each measurement was performed with one laser shot in the X-ray energy range from 90 to 300 eV. An X-ray absorption spectrum for induced liquid Si (liq*Si) was first observed above an energy density of 0.17 J/cm2. It differs significantly from the spectrum for amorphous Si and characteristically shows the disappearance of the Si-L(II,III) edge structure at around 100 eV. This phenomenon is interpreted in terms of a significant reduction in the 3s-like character of the unfilled part of the conduction band of liq*Si compared to that of amorphous Si. This is the first direct evidence that liq*Si has a metallic-like electronic structure. Timeresolved EXAFS results are also discussed briefly.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 51: Symposium A – Beam-Solid Interactions and Phase Transformations , 1985 , 119
Copyright
Copyright © Materials Research Society 1985

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References

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