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Bright source of Kα and continuum X rays by heating Kr clusters using a femtosecond laser

Published online by Cambridge University Press:  25 March 2004

R. ISSAC
Affiliation:
Department of Physics, University of Strathclyde, Glasgow, Scotland, United Kingdom
J. WIRTHIG
Affiliation:
Department of Physics, University of Strathclyde, Glasgow, Scotland, United Kingdom
E. BRUNETTI
Affiliation:
Department of Physics, University of Strathclyde, Glasgow, Scotland, United Kingdom
G. VIEUX
Affiliation:
Department of Physics, University of Strathclyde, Glasgow, Scotland, United Kingdom
B. ERSFELD
Affiliation:
Department of Physics, University of Strathclyde, Glasgow, Scotland, United Kingdom
S.P. JAMISON
Affiliation:
Department of Physics, University of Strathclyde, Glasgow, Scotland, United Kingdom
D. JONES
Affiliation:
Department of Physics, University of Strathclyde, Glasgow, Scotland, United Kingdom
R. BINGHAM
Affiliation:
Department of Physics, University of Strathclyde, Glasgow, Scotland, United Kingdom
D. CLARK
Affiliation:
Department of Physics, University of Strathclyde, Glasgow, Scotland, United Kingdom
D.A. JAROSZYNSKI
Affiliation:
Department of Physics, University of Strathclyde, Glasgow, Scotland, United Kingdom

Abstract

X rays emitted from Kr clusters illuminated by a femtosecond laser have been observed over a wide spectral region from 3 keV to 15 keV. The measured spectra are characterized by a broad bremsstrahlung continuum and Kα, β lines at 12.66 keV and 14.1 keV. To the best of the authors' knowledge, this is the first observation of Kα, β emission from laser-heated Kr clusters. The bremsstrahlung continuum arising from collisions in the plasma implies a population of hot electrons consistent with a temperature of several kiloelectron volts. The absolute X-ray yield in the 3–15 keV region is found to be of the order of 107 photons per laser pulse. The plasma temperature, estimated from the continuum part of the spectrum as a function of laser intensity and X-ray yield as a function of laser pulse duration, are studied.

Type
Research Article
Copyright
© 2003 Cambridge University Press

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