Wavenumber Scale Shift in Fourier Transform Infrared Spectrometers Due to Vignetting

Tomas Hirschfeld

Applied Spectroscopy
Vol. 30,
Issue 5,
pp. 549-550
(1976)

Wavenumber Scale Shift in Fourier Transform Infrared Spectrometers Due to Vignetting

Tomas Hirschfeld

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Tomas Hirschfeld, "Wavenumber Scale Shift in Fourier Transform Infrared Spectrometers Due to Vignetting," Appl. Spectrosc. 30, 549-550 (1976)

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Abstract

Absorbance subtraction spectra, a common application of Fourier transform infrared (FT-ir) spectrometers, typically requires wavenumber scale repeatabilities of the order of 10−3 cm−1. Such repeatabilities are possible only if both spectra are taken with the same or no vignetting, as the following analysis shows.

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Applied Spectroscopy