TY - JOUR KW - spectroscopy KW - x-ray AU - Dimitar Popmintchev AU - Benjamin Galloway AU - Ming-Chang Chen AU - Franklin Dollar AU - Christopher Mancuso AU - Amelia Hankla AU - Luis Miaja-Avila AU - Galen O'Neil AU - Justin Shaw AU - Guangyu Fan AU - Skirmantas Ališauskas AU - Giedrius Andriukaitis AU - Tadas Balčiunas AU - Oliver Mücke AU - Audrius Pugzlys AU - Andrius Baltuška AU - Henry Kapteyn AU - Tenio Popmintchev AU - Margaret Murnane AB -

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\textendash543 eV) using a high flux high-order harmonic generation x-ray supercontinuum with 109 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 1026 photons/s/mrad2/mm2/1\% 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.

BT - Physical Review Letters DA - 2018-03 DO - 10.1103/PhysRevLett.120.093002 N2 -

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\textendash543 eV) using a high flux high-order harmonic generation x-ray supercontinuum with 109 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 1026 photons/s/mrad2/mm2/1\% 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.

PY - 2018 T2 - Physical Review Letters TI - Near- and Extended-Edge X-Ray-Absorption Fine-Structure Spectroscopy Using Ultrafast Coherent High-Order Harmonic Supercontinua UR - https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.120.093002 VL - 120 SN - 0031-9007 ER -