ERRORS IN ABSORPTION MEASUREMENTS BY FOURIER TRANSFORM SPECTROSCOPY DUE TO FINITE INSTRUMENT RESOLUTION
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Date
1975
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Ohio State University
Abstract
Calculations have been performed of the errors introduced in the measurement of peak absorbances by Fourier transform spectroscopy as a result of the finite resolution of the instrument. A Lorentzian line shape and either box-car or triangular apodization has been assumed, For comparison with conventional infrared spectrometers, similar calculations were made assuming a triangular instrument (slit) function. Except for the case of large peak absorbances, the results for triangular apodization are similar to those for the triangular instrument function. Errors become increasingly large as the spectral resolution becomes greater than one-tenth the width of the line at half height. For box-car apodization, the errors are considerably smaller and become large only when resolution becomes greater than line width. Spectra of the $223 1 cm^{-1}$ band of benzonitrile in $CC1_{4}$ solutions have been obtained and generally confirm the results of the calculations. Practical comparisons of box-car and triangular apodization will be made.
Description
This research was supported, in part, by the National Science Foundation.
Author Institution: Department of Chemistry, Ithaca College; Department of Chemistry, Ohio University
Author Institution: Department of Chemistry, Ithaca College; Department of Chemistry, Ohio University