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Measurements of long-range electronic correlations during femtosecond diffraction experiments performed on nanocrystals of Buckminsterfullerene

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journal contribution
posted on 2023-04-04, 04:41 authored by RA Ryan, S Williams, Andrew V Martin, RA Dilanian, Connie DarmaninConnie Darmanin, CT Putkunz, David Wood, VA Streltsov, Michael WM Jones, N Gaffney, F Hofmann, GJ Williams, S Boutet, M Messerschmidt, MM Seibert, EK Curwood, Eugeniu BalaurEugeniu Balaur, Andrew PeeleAndrew Peele, Keith NugentKeith Nugent, HM Quiney, Brian AbbeyBrian Abbey
The precise details of the interaction of intense X-ray pulses with matter are a topic of intense interest to researchers attempting to interpret the results of femtosecond X-ray free electron laser (XFEL) experiments. An increasing number of experimental observations have shown that although nuclear motion can be negligible, given a short enough incident pulse duration, electronic motion cannot be ignored. The current and widely accepted models assume that although electrons undergo dynamics driven by interaction with the pulse, their motion could largely be considered ’random’. This would then allow the supposedly incoherent contribution from the electronic motion to be treated as a continuous background signal and thus ignored. The original aim of our experiment was to precisely measure the change in intensity of individual Bragg peaks, due to X-ray induced electronic damage in a model system, crystalline C60. Contrary to this expectation, we observed that at the highest X-ray intensities, the electron dynamics in C60were in fact highly correlated, and over sufficiently long distances that the positions of the Bragg reflections are significantly altered. This paper describes in detail the methods and protocols used for these experiments, which were conducted both at the Linac Coherent Light Source (LCLS) and the Australian Synchrotron (AS) as well as the crystallographic approaches used to analyse the data.

Funding

The authors acknowledge the support of the Australian Research Council Centre of Excellence in Advanced Molecular Imaging.

History

Publication Date

2017-08-22

Journal

JoVE - Journal of Visualized Experiments

Volume

126

Article Number

e56296

Pagination

11p.

Publisher

Journal of Visualized Experiments

ISSN

1940-087X

Rights Statement

© 2017 The Authors This is an open access article under the Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License