Time-resolved Fourier transform infrared spectroscopic imaging

Rohit Bhargava, Ira W. Levin

Research output: Contribution to journalArticle

Abstract

Fourier transform infrared (FT-IR) imaging allows simultaneous spectral characterization of large spatial areas due to its multichannel detection advantage. The acquisition of large amounts of data in the multichannel configuration results, however, in a poor temporal resolution of sequentially acquired data sets, which limits the examination of dynamic processes to processes that have characteristic time scales of the order of minutes. Here, we introduce the concept and instrumental details of a time-resolved infrared spectroscopic imaging modality that permits the examination of repetitive dynamic processes whose half-lives are of the order of milliseconds. As an illustration of this implementation of step-scan FTIR imaging, we examine the molecular responses to external electric-field perturbations of a microscopically heterogeneous polymer-liquid crystal composite. Analysis of the spectroscopic data using conventional univariate and generalized two-dimensional (2D) correlation methods emphasizes an additional capability for accessing of simultaneous spatial and temporal chemical measurements of molecular dynamic processes.

Original languageEnglish (US)
Pages (from-to)357-366
Number of pages10
JournalApplied Spectroscopy
Volume57
Issue number4
DOIs
StatePublished - Apr 1 2003
Externally publishedYes

Keywords

  • Fourier transform infrared imaging
  • Microspectroscopy
  • Molecular dynamics
  • Polymer-dispersed liquid crystals
  • Time-resolved spectroscopy

ASJC Scopus subject areas

  • Spectroscopy
  • Instrumentation

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