Abstract

A general method for the direct measurement of differential absorption intensities using a Fourier transform infrared spectrometer is described. The differential intensities must be higher in frequency than the interferogram frequencies and may arise from a periodic variation of the absorption strength of the sample, or by dichroic response of the sample to alternate states of polarization of the infrared beam. Specific expressions are presented for the measurement of circular and linear dichroism. These expressions represent an extension of the Grosjean-Legrand polarization modulation technique to Fourier transform interferometry.

Infrared Circular Dichroism and Linear Dichroism Spectrophotometer

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Appl. Opt. 14(2) 454-459 (1975)

Photothermal deflection Fourier transform spectroscopy: a tool for high-sensitivity absorption and dichroism measurements

D. Fournier, A. C. Boccara, and J. Badoz
Appl. Opt. 21(1) 74-76 (1982)

Polarization scrambling using a photoelastic modulator: Application to circular dichroism measurement

J. C. Cheng, L. A. Nafie, and P. J. Stephens
J. Opt. Soc. Am. 65(9) 1031-1035 (1975)

Quantum Fourier-transform infrared spectroscopy in the fingerprint region

Yu Mukai, Ryo Okamoto, and Shigeki Takeuchi
Opt. Express 30(13) 22624-22636 (2022)

New trends in the application of Fourier transform infrared spectroscopy to analytical chemistry

Tomas Hirschfeld
Appl. Opt. 17(9) 1400-1412 (1978)