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Ultrafast Laser Superheating of Metal Surfaces

Published online by Cambridge University Press:  25 February 2011

H. E. Elsayed ,
J. W. Herman  and
E. A. Murphy
H. E. Elsayed
Affiliation:
University of Rochester, Laboratory for Laser Energetics, 250 East River Road, Rochester, NY 14623–1299
J. W. Herman
Affiliation:
University of Rochester, Laboratory for Laser Energetics, 250 East River Road, Rochester, NY 14623–1299
E. A. Murphy
Affiliation:
University of Rochester, Laboratory for Laser Energetics, 250 East River Road, Rochester, NY 14623–1299
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Abstract

Reflection high-energy electron diffraction with ∼200-ps temporal resolution is used to study the structural dynamics of the closed-packed surfaces of single crystals of lead and bismuth subjected to ultrafast laser heating. By monitoring the temporal evolution of the diffraction streak intensity, information is obtained on the mean-square vibrational amplitude of the surface atoms and the structural integrity of the surface. Pb(lll) is observed to superheat by ∼120 k above the bulk melting point. With increased heating laser intensity, melting is observed to occur subsequent to superheating. Superheating of Bi(0001) by ∼85 K was also observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 279: Symposium A – Beam-Solid Interactions–Fundamentals and Applications , 1992 , 685
Copyright
Copyright © Materials Research Society 1993

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