Bulletin of the American Physical Society
53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 67, Number 7
Monday–Friday, May 30–June 3 2022; Orlando, Florida
Session K03: Ultrafast X-ray Science
10:30 AM–12:30 PM,
Wednesday, June 1, 2022
Room: Grand Ballroom B
Chair: Daniel Rolles, Kansas State
Abstract: K03.00003 : Timing dissociative dynamics of small molecules and dimers with internal clocks applying coincident particle momentum imaging*
11:30 AM–12:00 PM
Presenter:
Thorsten Weber
(Lawrence Berkeley National Laboratory)
Author:
Thorsten Weber
(Lawrence Berkeley National Laboratory)
In this presentation I will show how this demanding task can be accomplished with reaction microscopy while applying different internal clock mechanisms instead of pump-probe interrogation schemes. In particular, the change in charge state during sequential dissociation processes of small molecules and dimers is monitored in real-time in three examples: Upon photo double ionization with synchrotron radiation (a) the electron transfer via spin-orbit coupling in water molecules and (b) the interatomic decay of transient states in NeKr dimers is followed on the potential energy landscape and timed. Moreover, (c) the sequential emission of electrons during structural changes of oxygen molecules during charge-up after two X-ray absorption at the EuXFEL are traced, and the femtosecond dynamics of the dissociating ion is revealed.
*This work was supported by the U.S. Department of Energy Office of Basic Energy Sciences, Division of Chemical Sciences, Biosciences, and Geosciences under contract No. DE-AC02-05CH11231 and used the Advanced Light Source (ALS) and National Energy Research Computing Center (NERSC).
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