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Ultra-rapid-scanning Fourier transform infrared spectrometry

Authors
Journal
Vibrational Spectroscopy
0924-2031
Publisher
Elsevier
Publication Date
Volume
19
Issue
1
Identifiers
DOI: 10.1016/s0924-2031(99)00006-5
Keywords
  • Fourier Transform Infrared Spectrometry
  • Interferometer
  • Optical Path
Disciplines
  • Physics

Abstract

Abstract Several applications of Fourier transform infrared (FT-IR) spectrometry are discussed where both conventional rapid-scanning interferometers and step-scan interferometers are unable to provide the needed information. A new interferometer is described by which it is possible to acquire interferograms with 0.25 cm optical path difference (4 cm −1 spectral resolution) in less than 1 ms. The moving element of this interferometer is a tilted mirror that continuously rotates at a speed of up to 500 Hz. The performance of this spectrometer is demonstrated by examining the spark-initiated combustion of ethane and methane in air. The formation of vibrationally excited CO 2 and H 2O, with lifetimes approaching 50 ms, was observed.

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