Wavenumber Scale Shift in Fourier Transform Infrared Spectrometers Due to Vignetting

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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.

Keywords: Infrared; Instrumentation, FT-ir; Surface analysis

Document Type: Short Communication

DOI: http://dx.doi.org/10.1366/000370276774456886

Affiliations: Block Engineering, Inc., Cambridge, Massachusetts 02139

Publication date: September 1, 1976

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