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 DJ, 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

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