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

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6 Citations (Scopus)

Abstract

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
Volume47
Issue number9
DOIs
Publication statusPublished - 1993
Externally publishedYes

Fingerprint

Polyacetylenes
polyacetylene
Phase modulation
phase modulation
Infrared spectroscopy
infrared spectroscopy
infrared spectrophotometers
Infrared spectrophotometers
Photoexcitation
Frequency modulation
photoexcitation
quadratures
frequency modulation
Fourier transforms
Experiments
Infrared radiation
decay

Keywords

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

ASJC Scopus subject areas

  • Spectroscopy
  • Instrumentation

Cite this

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abstract = "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.",
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