Principle of the Measurement
A broadband light source passes through a Michelson interferometer, an absorption cell, and then to a detector. The interferogram is generated by making signal measurements at various positions of a moving mirror. A Fourier transform converts the interferogram from a mirror displacement (cm) domain into the inverse domain (cm-1), creating a spectrum of the signal at discrete wavelengths.
FTIR Instrument Models: Nicolet 560, Nicolet 760, Nicolet iS50
Species Measured: various gaseous reactants and products
Accuracy: ±5% at concentrations above detection limit
Spectral Resolution: minimum 0.125 cm-1
Time Domain: 10-120 s to acquire 1 cm-1 resolution spectra
Detectors / Beam Splitters:
Infrared absorption cross sections, On-line concentration measurements in kinetics experiments, Photolysis/reaction yield measurement, Determination of Radiative efficiencies and global warming potentials.
Bernard, F., D.K. Papanastasiou, V.C. Papadimitriou, and J.B. Burkholder, Infrared absorption spectra of N(CxF2x+1)3, x = 2-5 perfluoroamines, Journal of Quantitative Spectroscopy & Radiative Transfer, doi:10.1016/j.jqsrt.2018.02.039, 2018.
Bernard, F., D.K. Papanastasiou, V.C. Papadimitriou, and J.B. Burkholder, Infrared absorption spectra of linear (L2-L5) and cyclic (D3-D6) permethylsiloxanes, Journal of Quantitative Spectroscopy & Radiative Transfer, doi:10.1016/j.jqsrt.2017.08.006, 2017.