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Speckle contrast of interfering fluorescence X-rays
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2023 (English)In: Journal of Synchrotron Radiation, ISSN 0909-0495, E-ISSN 1600-5775, Vol. 30, no 1, p. 11-23Article in journal (Refereed) Published
Abstract [en]

With the development of X-ray free-electron lasers (XFELs), producing pulses of femtosecond durations comparable with the coherence times of X-ray fluorescence, it has become possible to observe intensity–intensity correlations due to the interference of emission from independent atoms. This has been used to compare durations of X-ray pulses and to measure the size of a focusedX-ray beam, for example. Here it is shown that it is also possible to observe the interference of fluorescence photons through the measurement of the speckle contrast of angle-resolved fluorescence patterns. Speckle contrast is often used as a measure of the degree of coherence of the incident beam or the fluctuations of the illuminated sample as determined from X-ray diffraction patterns formed by elastic scattering, rather than from fluorescence patterns as addressed here. Commonly used approaches to estimate speckle contrast were found to suffer when applied to XFEL-generated fluorescence patterns due to low photon counts and a significant variation of the excitation pulse energy from shot to shot. A new method to reliably estimate speckle contrast under such conditions, using a weighting scheme, is introduced. The method is demonstrated by comparing the speckle contrast of fluorescence observed with pulses of 3 fs to 15 fs duration.

Place, publisher, year, edition, pages
International Union of Crystallography (IUCr) International Union Of Crystallography, 2023. Vol. 30, no 1, p. 11-23
Keywords [en]
speckle contrast estimation, X-ray fluorescence, incoherent diffraction imaging, XPCS
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:uu:diva-495130DOI: 10.1107/s1600577522009997ISI: 000908417600002PubMedID: 36601922OAI: oai:DiVA.org:uu-495130DiVA, id: diva2:1730436
Funder
German Research Foundation (DFG), 390715994Swedish Research Council, 2019-03935Swedish Research Council, 2018-00740Available from: 2023-01-24 Created: 2023-01-24 Last updated: 2024-01-15Bibliographically approved

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Caleman, CarlTimneanu, NicusorChapman, Henry N.

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