Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session B05: Attosecond Electron Dynamics
10:45 AM–12:45 PM,
Tuesday, June 4, 2024
Room: 202AB
Chair: Robert Baker, Ohio State University
Abstract: B05.00003 : Angular streaking with attosecond x-ray pulses*
11:45 AM–12:15 PM
Presenter:
Siqi Li
(SLAC National Lab)
Authors:
Siqi Li
(SLAC National Lab)
Agostino Marinelli
(SLAC NATIONAL ACCELERATOR LABORATORY)
James P Cryan
(SLAC National Accelerator Laboratory)
Taran Driver
(SLAC)
Collaboration:
XLEAP collaboration
The fundamental process of interaction between light and matter involves ultrafast electron motions in atoms and molecules. The pursuit of understanding electron motion drives the development of attosecond x-ray pulses. Together with the unique properties of a free-electron laser, we can extend the attosecond x-ray pulse to the soft x-ray regime, and also to reach high enough intensity to drive interesting processes including nonlinear interactions. At the Linac Coherent Light Source (LCLS), where a relativistic electron bunch travels through an undulator, coherent x-ray laser pulses are generated. We manipulate the electron beam to alter the electron distribution in the bunch, resulting in the emission of an attosecond x-ray pulse in the undulator. Subsequently, a velocity map imaging spectrometer collects photoelectrons emitted from gas molecules interacting with the x-ray photons. The momentum distribution of these photoelectrons is measured and decoded using a reconstruction algorithm to characterize the attosecond x-ray pulses. Beyond attosecond pulse characterization, angular streaking serves as a time-resolved measurement technique for studying ultrafast electron motions, including Auger Meitner decay and photoemission delay. The presentation will delve into the exciting results of measuring and controlling electronic coherences in core-excited states, which paves the way for a wide range of applications in ultrafast science.
*We would like to acknowledge the support from US Department of Energy contract nos. DE-AC02-76SF00515, DOE-BES Accelerator and detector research program Field Work Proposal 100317, DOE-BES, Chemical Sciences, Geosciences, and Biosciences Division, and Department of Energy, Laboratory Directed Research and Development program at SLAC National Accelerator Laboratory, under contract DE-AC02-76SF00515.
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