Infrared reflectance spectra have been investigated on TTF-chloranil single crystals near the neutral-to-ionic phase transition temperature TC. It was confirmed that abrupt changes in the ionicity and the stack dimerization take place simultaneously at TC. The effect of an external electric field and light irradiation upon the dimerized lattice below TC has been investigated by reflectance measurements.
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Tokura et al. (1985) studied this question.
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