Near- and extended-edge x-ray-absorption fine-structure spectroscopy using ultrafast coherent high-order harmonic supercontinua

Published: March 01, 2018


Dimitar Popmintchev, Benjamin Galloway, Ming-Chang Chen, Franklin Dolar, Christopher Mancuso, Amelia Hankla, Luis Miaja Avila, Galen C. O'Neil, Guangyu Fan, Skirmantas Alisauskas, Giedrius Andriukaitis, Tadas Balciunas, Oliver M?cke, Audrius Pugzlys, Andrius Baltuska, Henry C. Kapteyn, Tenio Popmintchev, Margaret M. Murnane


Phase matching of the high-order harmonic generation process now makes it possible to produce spatially and temporally coherent ultrafast X-ray beams, with bandwidths spanning more than 12 octaves, from the UV to the keV region. Here we report the first static X-ray absorption spectroscopy at the K- and L-absorption edges of solids in the near-keV range. We also demonstrate X-ray absorption spectroscopy in the ‘water window’ spectral region (284 – 541 𝑒𝑉) using an X-ray supercontinuum with high flux (109 𝑝ℎ𝑜𝑡𝑜𝑛𝑠/𝑠 𝑖𝑛 1% 𝑏𝑎𝑛𝑑𝑤𝑖𝑑𝑡ℎ), which is two orders of magnitude larger than has been previously demonstrated. In the future, because this X-ray radiation emerges as an isolated single attosecond-to-femtosecond burst, with peak brilliance exceeding 1026 𝑝ℎ𝑜𝑡𝑜𝑛𝑠/𝑠/𝑚𝑟𝑎𝑑2/𝑚𝑚2/1% 𝑏𝑎𝑛𝑑𝑤𝑖𝑑𝑡ℎ, these novel coherent X-ray sources will be ideal for dynamic probing of the fastest processes in molecules and materials on sub-femtosecond time and picometer length scales.
Citation: Physical Review B
Volume: 120
Issue: 9
Pub Type: Journals


x-ray absorption, spectroscopy, ultrafast coherent, harmonic supercontinua
Created March 01, 2018, Updated November 10, 2018