Abstract
The dynamical process of photoinduced phase transition from the mixed-valence (MV) state to a single-valence (SV) state has been investigated in a gold complex Cs 2Au 2Br 6 by means of high-pressure Raman spectroscopy. We have found that the MV fraction decreases with excitation shot number, which is well reproduced by a contracted-exponential function. Such a characteristic dynamical behavior has been interpreted in terms of the stochastic formation of the photo-generated SV clusters and subsequent growth of the size.
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