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We investigate the spontaneous reduction of a photochromic surfactant/polyoxotungstate hybrid during repeated X‐ray photoelectron spectroscopy (XPS) scans and show how this effect may confound attempts to use soft X‐rays to characterise materials of this nature. The W4f core‐level spectra revealed a progressive increase of W5+ and W4+ species at the expense of W6+ as irradiation time increased. The...
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