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Figure 13
(a1) The measured V K-edge V2O5 XAS absorption spectrum μ(E) was denoised using a Gaussian process denoiser combined with stationarity warping. (a2) Comparison of k2χ(k) for noisy, clean, and denoised spectra. Denoising suppresses high-frequency noise while preserving the underlying EXAFS oscillations. (a3) Corresponding Fourier-transformed EXAFS magnitude |χ(R)|, showing that denoising reduces noise-related artifacts at larger R without introducing additional peaks in the first coordination shells. (b1, b2) Morever, denoising tends to not introduce additional features within the χ(k) and χ(R) signals. By varying the Butterworth denoiser cutoff frequency, we demonstrate that denoising suppresses existing features without introducing additional peaks. (c1, c2) Effect of different uniform k-grid step sizes on |χ(R)| for a clean spectrum and noisy spectrum. Coarser k-grid sampling leads to significant distortions due to interpolation artifacts for noisy data, highlighting the importance of appropriate k-grid selection when analyzing noisy EXAFS data.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 3| May 2026| Pages 658-682
https://doi.org/10.1107/S1600577526001712
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