The temperature dependence of the I K-edge extended X-ray absorption fine-structure (EXAFS) spectra of a highly oriented iodine-containing polyvinyl alcohol (I-PVA) film was investigated in order to reveal any local structures around I. It was firstly demonstrated that an analysis of the EXAFS amplitude, which is associated with the Debye–Waller factor (mean square relative displacement) provides information concerning the composition ratio of the dopant species. In the present high-contrast I–PVA film it was found that a significant amount (64%) of isolated I− is present, and that the polyiodine species, which contributes to a high polarization property of I–PVA for ultraviolet and visible light, consists of 21% I3− and 15% I5−, without containing neutral I2.
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Yokoyama et al. (1995) studied this question.
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