Photoexcited effects have been investigated for Co-Fe cyanides, K0.18Co[Fe(CN)₆]0.82·4.57H₂O and K0.45Co[Fe(CN)₆]0.87·4.80H₂O, by means of the transient absorption method. For both the compounds, the photoexcitation at 532 nm induces a structural change into a metastable phase at 91 K, and the relaxation time τ exponentially decreases as temperature increases. We have found a faster decay process (τ₂=10--40ms) that dominates above ~220K, and discuss its interrelation with the photoinduced structural change.
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Kamiya et al. (2004) studied this question.
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