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Near- and Extended-Edge X-Ray-Absorption Fine-Structure Spectroscopy Using Ultrafast Coherent High-Order Harmonic Supercontinua.

  • Author(s): Popmintchev, Dimitar
  • Galloway, Benjamin R
  • Chen, Ming-Chang
  • Dollar, Franklin
  • Mancuso, Christopher A
  • Hankla, Amelia
  • Miaja-Avila, Luis
  • O'Neil, Galen
  • Shaw, Justin M
  • Fan, Guangyu
  • Ališauskas, Skirmantas
  • Andriukaitis, Giedrius
  • Balčiunas, Tadas
  • Mücke, Oliver D
  • Pugzlys, Audrius
  • Baltuška, Andrius
  • Kapteyn, Henry C
  • Popmintchev, Tenio
  • Murnane, Margaret M
  • et al.

Recent advances in high-order harmonic generation have made it possible to use a tabletop-scale setup to produce spatially and temporally coherent beams of light with bandwidth spanning 12 octaves, from the ultraviolet up to x-ray photon energies >1.6  keV. Here we demonstrate the use of this light for x-ray-absorption spectroscopy at the K- and L-absorption edges of solids at photon energies near 1 keV. We also report x-ray-absorption spectroscopy in the water window spectral region (284-543 eV) using a high flux high-order harmonic generation x-ray supercontinuum with 10^{9}  photons/s in 1% bandwidth, 3 orders of magnitude larger than has previously been possible using tabletop sources. Since this x-ray radiation emerges as a single attosecond-to-femtosecond pulse with peak brightness exceeding 10^{26}  photons/s/mrad^{2}/mm^{2}/1% bandwidth, these novel coherent x-ray sources are ideal for probing the fastest molecular and materials processes on femtosecond-to-attosecond time scales and picometer length scales.

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