Phase-modulation infrared spectroscopy and its application to measurements of photo-induced absorptions from trans-polyacetylene

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The outline of phase-modulation infrared spectroscopy is described. The relationship between the frequency-domain response from phase-modulation experiments and the time-domain response from time-resolved experiments is derived. The microsecond dynamics following photoexcitation in trans-polyacetylene has been studied by phase-modulation infrared spectroscopy. The magnitude and phase (or in-phase and quadrature components) of the photo-induced infrared band at 1367 cm J have been measured at 78 K with modulation frequencies between 600 Hz and 10.5 kHz by using an experimental setup based on a continuousscan Fourier transform infrared spectrophotometer. The magnitude of this band shows an approximate ε-1 dependence for frequencies below 9 kHz and a rapid decrease above 9 kHz. These results are inconsistent with a unimolecular decay, which should show a dependence of the form ε-1.

Original languageEnglish
Pages (from-to)1405-1410
Number of pages6
JournalApplied Spectroscopy
Issue number9
Publication statusPublished - 1993
Externally publishedYes



  • Conducting polymer
  • Fourier transform infrared spectroscopy
  • Phase-modulation infrared spectroscopy
  • Photoexcitation
  • Polyacetylene

ASJC Scopus subject areas

  • Spectroscopy
  • Instrumentation

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