Journal Article

PUBDB-2026-02881

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Microsecond X-ray reflectometry

Haberl, M. ; Eder, M.Extern* ; Pfeiler, E.Extern* ; Schumi-Mareček, D. ; Bertram, F.DESY* ; Mikulík, P.Extern* ; Kowarik, S. (Corresponding author)Extern*

2026
Munksgaard Copenhagen

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Please use a persistent id in citations: doi:10.1107/S1600576726004449  doi:10.3204/PUBDB-2026-02881

Abstract: We accelerate synchrotron X-ray reflectometry (XRR) by more than an order of magnitude and demonstrate the acquisition of full reflectivity curves within 213 µs over a q$_z$ range of 0.05 to 0.35 Å$^{−1}$ at 0.001 Å$^{−1}$ resolution. This is achieved by rapidly sweeping the incidence angle with a high-speed galvanometer and recording the reflected beam on an area detector. The method preserves a monochromatic parallel-beam geometry, requires only straightforward geometric and exposure time corrections, and yields quantitative agreement with standard XRR in thickness, density and roughness. At the shortest acquisition times, the photon statistics enter the low-count Poisson regime, where conventional least-squares fitting becomes biased. We show that applying an Anscombe variance-stabilizing transform restores near-Gaussian error behavior and significantly improves fitting robustness. Our approach benefits not only ultrafast XRR but reflectometry data in general at large q$_z$, where count rates are intrinsically low. This advance enables time-resolved studies of thin-film growth, diffusion, photoswitching and other rapid kinetic processes. Keywords: X-ray reflectometry; fast measurements; thin films; Anscombe transform; galvanometer scanning.

Note: BMBF forfunding of the Eiger2X detector through ErUM Pro05K19FK2 (Murphy)

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. PETRA-D (FS-PETRA-D)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. FS-Proposal: I-20230645 EC (I-20230645-EC) (I-20230645-EC)

Experiment(s):

1. PETRA Beamline P08 (PETRA III)

Appears in the scientific report 2026

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; PubMed Central ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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