@article{4300,
  keywords = {spectroscopy, x-ray},
  author = {Dimitar Popmintchev and Benjamin Galloway and Ming-Chang Chen and Franklin Dollar and Christopher Mancuso and Amelia Hankla and Luis Miaja-Avila and Galen O'Neil and Justin Shaw and Guangyu Fan and Skirmantas Ališauskas and Giedrius Andriukaitis and Tadas Balčiunas and Oliver Mücke and Audrius Pugzlys and Andrius Baltuška and Henry Kapteyn and Tenio Popmintchev and Margaret Murnane},
  title = {Near- and Extended-Edge X-Ray-Absorption Fine-Structure Spectroscopy Using Ultrafast Coherent High-Order Harmonic Supercontinua},
  abstract = {<p>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 \&gt;1.6 keV. Here we demonstrate the use of this light for x-ray-absorption spectroscopy at the <em>K</em>- and <em>L</em>-absorption edges of solids at photon energies near 1 keV. We also report x-ray-absorption spectroscopy in the water window spectral region (284\textendash543 eV) using a high flux high-order harmonic generation x-ray supercontinuum with 10<sup>9</sup> 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<sup>26</sup> photons/s/mrad<sup>2</sup>/mm<sup>2</sup>/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.</p>},
  year = {2018},
  journal = {Physical Review Letters},
  volume = {120},
  month = {2018-03},
  issn = {0031-9007},
  url = {https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.120.093002},
  doi = {10.1103/PhysRevLett.120.093002},
}