An account is given of the polarization occurring within the Perkin-Elmer models 421 and 521 infrared grating spectrophotometers. It is shown that the use of gratings in these instruments results in considerable polarization of the energy beam. The efficiency curves and the degree of polarization curves for the two components of polarization are given as a function of frequency. The polarization properties of the microsampling unit and the attenuated total reflectance accessory are also investigated.
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