A sub-Doppler spectroscopic technique using a Fresnel rhomb is combined with the White multiple-reflection cell to increase the sensitivity of ultrahigh-resolution spectroscopy. Microwave sidebands on CO2 laser radiation have been used as a frequency-tunable infrared source with high spectral purity. A gain of 4–8 in the path length with a resolution of ~100 kHz has been readily obtained. Applications of this method to observation of the hyperfine structure of NH3 and PH3, the K doubling of PH3, and the Stark spectrum of PH3 and SiH4 are given.
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Chen et al. (1986) studied this question.
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