|Title||Near- and Extended-Edge X-Ray-Absorption Fine-Structure Spectroscopy Using Ultrafast Coherent High-Order Harmonic Supercontinua|
|Publication Type||Journal Article|
|Year of Publication||2018|
|Authors||Popmintchev, D, Galloway, BR, Chen, M-C, Dollar, F, Mancuso, CA, Hankla, A, Miaja-Avila, L, O’Neil, G, Shaw, JM, Fan, G, Ališauskas, S, Andriukaitis, G, Balčiunas, T, Mücke, OD, Pugzlys, A, Baltuška, A, Kapteyn, HC, Popmintchev, T, Murnane, MM|
|Journal||Physical Review Letters|
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 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.
|Short Title||Phys. Rev. Lett.|