Temperature-dependent resonance Raman study of iodine-doped polyt( vinyl alcohol) films

Archita Sengupta, Mark Holtz, Edward L. Quitevis

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Abstract

The resonance Raman spectrum of iodine-doped poly(vinyl alcohol) films was studied as a function temperature from 77 to 290 K. The main bands in the spectrum are assigned to fundamental and overtone bands of linear I-3 and I-5. The presence of combination bands in the spectrum is attributed to exciton coupling between these species in polyiodide chains. The low-temperature measurements allowed us to resolve new spectral features. At 77 K, the spectrum showed evidence for minor amounts of I2 and isomers of the main polyiodide components. The optical properties of the PVA-iodine complex are not simple and cannot be assigned to any single polyiodide species.

Original languageEnglish
Pages (from-to)25-32
Number of pages8
JournalChemical Physics Letters
Volume263
Issue number1-2
DOIs
StatePublished - Dec 6 1996

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