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Effects of the Grazing Incidence Geometry on X-ray Photon Correlation Spectroscopy Measurements

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00007062
URN to cite this document: urn:nbn:de:bvb:703-epub-7062-2

Title data

Greve, Christopher R. ; Kuhn, Meike ; Eller, Fabian ; Buchhorn, Michael A. ; Hexemer, Alexander ; Freychet, Guillaume ; Wiegart, Lutz ; Herzig, Eva M.:
Effects of the Grazing Incidence Geometry on X-ray Photon Correlation Spectroscopy Measurements.
In: Langmuir. Vol. 39 (1 June 2023) Issue 23 . - pp. 8215-8223.
ISSN 1520-5827
DOI der Verlagsversion: https://doi.org/10.1021/acs.langmuir.3c00669

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Project information

Project title:
Project's official title
Project's id
Deutsche Forschungsgemeinschaft (DFG) through TUM International Graduate School of Science and Engineering (IGSSE)
GSC 81
Bayerisches Staatsministerium für Wissenschaft und Kunst through Solar Technologies go Hybrid (SolTech)
No information

Project financing: Bayerisches Staatsministerium für Wissenschaft, Forschung und Kunst
Deutsche Forschungsgemeinschaft
U.S. Departement of Energy
Bayerisch-Kalifornischen Hochschulzentrum (BaCaTec)

Abstract

X-ray photon correlation spectroscopy (XPCS) is a versatile tool to measure dynamics on the nanometer to micrometer scale in bulk samples. XPCS has also been applied in grazing incidence (GI) geometry to examine the dynamics of surface layers. However, considering GI scattering experiments more universally, the GI geometry leads to a superposition of signals due to reflection and refraction effects, also known from the distorted-wave Born approximation (DWBA). In this paper, the impact of these reflection and refraction effects on the correlation analysis is determined experimentally by measuring grazing incidence transmission XPCS (GT-XPCS) and grazing incidence XPCS (GI-XPCS) simultaneously for a thin film sample, showing non-equilibrium dynamics. The results of the GI and GT geometry comparisons are combined within the framework of the standardly applied, simplified DWBA. These calculations allow identifying the main contributions of the detected signal from the leading scattering terms along the out-of-plane direction qz, which dominate the measured intensity pattern on the detector. In combination with the calculation of the non-linear effect of refraction in GTSAXS and GISAXS, it is possible to identify experimental conditions that can be chosen to run experiments and data analysis as close as possible to transmission XPCS and to explain which limitations for data interpretations are observed. Consequently, the beam exposure can be significantly reduced by using GI geometry only. Calculations of experimental settings prior to experiments are detailed to determine suitable qz regions for a variety of material systems measured in bulk-sensitive GI-XPCS experiments, allowing us to determine the scaling behavior of typical decay times as a function of q that is comparable to the scaling behavior obtained in distortion-free GT-XPCS or transmission XPCS experiments.

Further data

Item Type: Article in a journal
Additional notes (visible to public): This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.langmuir.3c00669.
Keywords: coherent scattering; X-ray photon correlation spectroscopy; GISAXS; DWBA
DDC Subjects: 500 Science > 530 Physics
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Experimental Physics VII - Dynamics and Structure Formation > Professor Experimental Physics VII - Dynamics and Structure Formation - Univ.-Prof. Dr. Eva M. Herzig
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Experimental Physics VII - Dynamics and Structure Formation
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-7062-2
Date Deposited: 03 Jun 2024 05:42
Last Modified: 03 Jun 2024 05:52
URI: https://epub.uni-bayreuth.de/id/eprint/7062

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