Abstract

The realization of a multiplex advantage using a Fabry–Perot interferometer has been demonstrated in the investigation of periodic spectra. Regularly spaced spectral lines can be simultaneously transmitted by a Fabry–Perot interferometer when the free spectral range is equal to the frequency difference between adjacent spectral lines. This new spectroscopic technique has been applied to the study of rotational Raman scattering in gases. Analysis of the interferograms provides a direct determination of the rotational B constant without having first to transform the interferogram. Experimental results for N₂O are: (a) neglecting centrifugal distortion effects, B = (0.418 71 ± 0.000 03) cm⁻¹; (b) correcting for centrifugal-distortion effects using the microwave value for D_J, B = (0.419 04 ± 0.000 03) cm⁻¹. The corrected B value agrees with the microwave B value to within 0.000 04 cm⁻¹. The advantages of this new interferometric method are high resolution, excellent sensitivity, simple, compact design, and the ability to obtain the rotational constant directly from the interferogram.

© 1971 Optical Society of America

Gas temperature and centrifugal distortion constant determination from profiles of rotational Raman interferometric spectra

J. J. Barrett
J. Opt. Soc. Am. 66(8) 801-812 (1976)

Analysis of Fabry–Perot interferograms of periodic spectra

R. L. Armstrong
J. Opt. Soc. Am. 64(6) 871-876 (1974)

Vibrational and rotational–translational temperatures in N₂ by interferometric measurement of the pure rotational Raman effect

J. J. Barrett and A. B. Harvey
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Use of a Fabry–Perot interferometer to isolate pure rotational Raman spectra of diatomic molecules

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Spectroscopic Studies of Stark Effect in CH₃Cl and its Application to Q Switching of the CO₂ Laser

Adam D. Devir
J. Opt. Soc. Am. 61(12) 1660-1665 (1971)