We present in-situ studies of H loss from YHO films using ion beam analysis and its effect on the photochromic properties. The film evaporates loosely bound H under exposure to a beam of 3056 keV He2+ without a concomitant increase of O. Annealing at 145 °C decreases both the photochromic contrast and the bleaching speed indicating the importance of mobile H for the photochromic reaction.
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Moldarev et al. (2024) studied this question.
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