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

Autor: Popmintchev D; JILA, University of Colorado at Boulder, Boulder, Colorado 80309-0440, USA., Galloway BR; JILA, University of Colorado at Boulder, Boulder, Colorado 80309-0440, USA., Chen MC; National Tsing Hua University, Institute of Photonics Technologies, Hsinchu 30013, Taiwan., Dollar F; JILA, University of Colorado at Boulder, Boulder, Colorado 80309-0440, USA., Mancuso CA; JILA, University of Colorado at Boulder, Boulder, Colorado 80309-0440, USA., Hankla A; JILA, University of Colorado at Boulder, Boulder, Colorado 80309-0440, USA., Miaja-Avila L; National Institute of Standards and Technology, Boulder, Colorado 80305, USA., O'Neil G; National Institute of Standards and Technology, Boulder, Colorado 80305, USA., Shaw JM; National Institute of Standards and Technology, Boulder, Colorado 80305, USA., Fan G; Photonics Institute, TU Wien, Gusshausstrasse 27-387, A-1040 Vienna, Austria., Ališauskas S; Photonics Institute, TU Wien, Gusshausstrasse 27-387, A-1040 Vienna, Austria.; Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607 Hamburg, Germany., Andriukaitis G; Photonics Institute, TU Wien, Gusshausstrasse 27-387, A-1040 Vienna, Austria., Balčiunas T; Photonics Institute, TU Wien, Gusshausstrasse 27-387, A-1040 Vienna, Austria., Mücke OD; Center for Free Electron Laser Science (CFEL), Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607 Hamburg, Germany.; The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany., Pugzlys A; Photonics Institute, TU Wien, Gusshausstrasse 27-387, A-1040 Vienna, Austria., Baltuška A; Photonics Institute, TU Wien, Gusshausstrasse 27-387, A-1040 Vienna, Austria., Kapteyn HC; JILA, University of Colorado at Boulder, Boulder, Colorado 80309-0440, USA., Popmintchev T; JILA, University of Colorado at Boulder, Boulder, Colorado 80309-0440, USA., Murnane MM; JILA, University of Colorado at Boulder, Boulder, Colorado 80309-0440, USA.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2018 Mar 02; Vol. 120 (9), pp. 093002.
DOI: 10.1103/PhysRevLett.120.093002
Abstrakt: 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.
Databáze: MEDLINE