The Finite Impulse Response Operator (FIRO) method for improving the resolution of bands in a frequency-domain spectrum, developed recently by Jones and Shimokoshi (Applied Spectroscopy <i>37</i>, 59 (1983)), is discussed in detail and its relationship to the analogous method of Kauppinen <i>et al.</i> (Applied Spectroscopy <i>35</i>, 271 (1981), is shown. Under-, self-, and over-deconvolution are discussed for simulated and experimental spectra. Deconvolution of instrumentally broadened bands is discussed and implemented for the <i>v</i><sub>1</sub> Raman band of CCl<sub>4</sub>; use of a Gauss-Lorentz lineshape gives the best results for this band. General guidelines for application of the FIRO method are also given.
W. I. Friesen and K. H. Michaelian, "Deconvolution in the Frequency Domain," Appl. Spectrosc. 39, 484-490 (1985)
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