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

作者：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; Alisauskas Skirmantas; Andriukaitis Giedrius; Balciunas Tadas; Muecke Oliver D; Pugzlys Audrius; Baltuska Andrius; Kapteyn Henry C; Popmintchev Tenio; Murnane Margaret M

来源：Physical Review Letters, 2018, 120(9): 093002.

DOI：10.1103/PhysRevLett.120.093002

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.

• 出版日期2018-3-1
• 单位清华大学