Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session X05: Time-Resolved Studies with Advanced Light Facilities
8:00 AM–9:54 AM,
Friday, June 9, 2023
Room: 205
Chair: Ruaridh Forbes, SLAC National Accelerator Laboratory
Abstract: X05.00007 : Viewing time-resolved X-ray scattering data in a maximally sparse basis*
9:30 AM–9:42 AM
Presenter:
Ian Gabalski
(Stanford Univ)
Authors:
Ian Gabalski
(Stanford Univ)
Malick Sere
(Stanford University)
Kyle Acheson
(University of Edinburgh)
Felix Allum
(Stanford University)
Sebastien Boutet
(SLAC - Natl Accelerator Lab)
Gopal Dixit
(MBI Berlin)
Ruaridh Forbes
(SLAC National Accelerator Laboratory)
James M Glownia
(SLAC - Natl Accelerator Lab)
Nathan Goff
(Brown University)
Kareem Hegazy
(Stanford Univ)
Andrew J Howard
(Stanford University)
Mengning Liang
(SLAC Natl Accelerator Lab)
Michael Minitti
(SLAC Natl Accelerator Lab)
Russell S Minns
(University of Southampton)
Adi Natan
(SLAC National Accelerator Laboratory)
Nolan Peard
(Stanford University)
Weronika O Razmus
(University of Southampton)
Roseanne J Sension
(University of Michigan)
Matthew Ware
(Stanford University)
Peter M Weber
(Brown University)
Nicholas Werby
(Stanford University)
Thomas J Wolf
(SLAC National Accelerator Laboratory)
Adam Kirrander
(Oxford University)
Philip H Bucksbaum
(Stanford Univ)
Our remedy to this problem is to utilize a Hough transform applied to FRXS data to achieve simultaneous sparsity for two important classes of molecular motion: vibration and dissociation. Vibrations and dissociations have one-dimensional sparsity in FRXS data, appearing as linear features in (Q,ω) space. The Hough transform reduces these features to points in (slope, y-intercept) space. Molecular motion can then be extracted via simple one-dimensional lineouts of the Hough transform, yielding information such as vibrational frequency, dissociation velocity distribution, and fragment rovibrational states. Experimental results are presented to showcase the Hough transform technique.
*This work is supported by the AMOS program in the Chemical Sciences, Geosciences, and Biosciences Division of Basic Energy Sciences at the U.S. Department of Energy.
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