The color change of a novel photochromic polymer film of 4,4′-bipyridinium-tetrakis [3,5-bis(trifluoromethyl)phenyl]borate was shown to occur in less than 20 ps by the ps-laser excitation of an ion-pair charge-transfer band due to photoinduced electron transfer, which may be applied to ultrafast photon-mode recording.
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Nagamura et al. (1993) studied this question.
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