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  • CLEO/Europe and IQEC 2007 Conference Digest
  • (Optica Publishing Group, 2007),
  • paper CG2_3

X-ray absorption spectroscopy in the keV range with laser generated high harmonic radiation

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Abstract

An impressive effort in the last years has culminated in the demonstration of time-resolved x-ray diffraction1 and x-ray absorption spectroscopy2 allowing monitoring the nuclear motion of molecules, crystal lattices at their natural timescale. On the other hand extended x-ray absorption fine structure spectroscopy (EXAFS) has been used to gain information about the atomic separations in molecules in their natural environment or in disordered solids. In the recent years high-harmonic (HH) sources have been developed in the XUV range3 enabling time resolved x-ray spectroscopy on the femtosecond4 or attosecond5 time scale. Parallel to the pulse shortening the cut-off has been extended into the sub-keV range6,7. Here we demonstrate that by applying non-adiabatic non-adiabatic non-adiabatic-self-phase-matching the photon flux and cut-off can be increased allowing EXAFS measurements in the keV range8. By evaluating the fine structure of the static x-ray absorption spectra near the L-edge of Ti and Cu, and the K-edge of Al and Si we determined the atomic distance of amorphous samples.

© 2007 IEEE

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