Rapid-scan Millisecond Time-resolved FT-IR Measurements

Rapid-scan Millisecond Time-resolved FT-IR Measurements 

Both dispersive monochrometers and Fourier Transform IR (FT-IR) spectrometers can be used in recording SEIRA spectra, but FT-IR spectrometers are more convenient owing to Fellgefs, Jacquino s, and Connees s advantages [128]. The time-resolution of FT-IR spectroscopy is determined by the scan rate of the interferometer. Tens to hundreds of milliseconds time-resolution can easily be achieved by the use of modern rapid-scan FT-IR spectrometers at spectral resolutions of 4 or 8 cm .  

A higher time resolution of 28 ms was used in a rapid-scan time-resolved SEIRA study of adsorption kinetics of uracil on a quasi-Au(lll) electrode surface [15]. Since the adsorption/desorption of uracil is reversible, the S/N of the spectra were enhanced by averaging 64 consecutive repetitions. This study showed that the kinetics is represented by the first-order rate equation, and that the rate constants evaluated from the time-resolved SEIRAS are much smaller than those for overall transition determined by chronoamperometry. The result suggests that the processes observed by the two measurements are not the same. 

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