Speaker
Description
Probing the ultrafast motion of electrons that drive chemical reactions and determine material properties requires state-of-the-art light sources with attosecond pulse duration. Soft X-ray pulses can probe electronic densities with atomic-site specificity. The advent of X-ray free-electron lasers (XFELs) has increased the per-pulse flux of attosecond sources by orders of magnitude, enabling powerful techniques like nonlinear multidimensional X-ray spectroscopy; however, the high statistical demands of these measurements translate into extremely long acquisition times at such low-repetition-rate facilities. Here, we demonstrate the generation and temporal characterization of isolated attosecond X-ray pulses at 33.2 kHz repetition rate from a continuous-wave (CW) superconducting accelerator. This advancement in repetition rate allowed for a two-orders-of-magnitude reduction in data acquisition time shown in a representative attosecond pump-probe experiment, paving the way for mapping complex, high-dimensional ultrafast dynamics.complex, high-dimensional ultrafast dynamics.
Funding Agency
Work at LCLS/SLAC supported by DOE-BES (DE-AC02-76SF00515). Additional support from DOE-BES (ADRP, CSGB) & Stanford fellowships.
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