Bright source of K [alpha] and continuum X rays by heating Kr clusters using a femtosecond laser

R.C. Issac, J. Wirthig, E. Brunetti, G. Vieux, B. Ersfeld, S.P. Jamison, D. Jones, R. Bingham, D. Clark, D.A. Jaroszynski

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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 K[alpha], [beta] lines at 12.66 keV and 14.1 keV. To the best of the authors' knowledge, this is the first observation of K[alpha], [beta] 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.
Original languageEnglish
Pages (from-to)535-540
Number of pages5
JournalLaser and Particle Beams
Issue number4
Publication statusPublished - Dec 2003


  • cluster nanoplasma
  • intense lasers
  • rare gas clusters
  • X-ray generation

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