European XFEL Science Seminar

Attosecond Science at the Linac Coherent Light Source

by James P. Cryan (Stanford PULSE Institute, SLAC National Accelerator Laboratory)

Zoom meeting (virtual conference )

Zoom meeting

virtual conference


I will describe our first results using isolated attosecond soft X-ray pulses from an X-ray free electron laser (XFEL) (1) . This new attosecond source produces peak powers on the gigawatt scale and opens the door for a suite of X-ray spectroscopies probing few- to sub-femtosecond dynamics. High peak power pulses facilitate nonlinear spectroscopies such as attosecond X-ray pump/attosecond X-ray probe, and wave mixing. Moreover, the inherent tunability of an XFEL source allows the selective probing of different core-to-valence transitions at disparate atomic site in a molecule, providing an atomic site-specific probe of valence electron dynamics. 

I will show results demonstrating single-shot attosecond pulse characterization (1), the preparation of a coherent electronic wavepacket via stimulated X-ray Raman scattering (2), and methods for exploiting the chaotic nature of SASE x-ray pulses to preform measurements with high temporal and spectral resolution (3). In addition, I will present measurements time resolving x-ray photoemission of both pre-edge (resonant Auger) and post-edge (direct) K-shell ionization. 

This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division. Use of the Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. 

(1) Duris, Li et al., Nat. Phot. 14, 30 (2020)

(2) O'Neal et al. PRL 125, 073203 (2020)

(3) Driver et al. PCCP 22, 2704-2712 (2020)

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