Abstract

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.

© 1986 Optical Society of America

Sub-Doppler spectroscopy of the C—O stretching fundamental band of methanol by use of microwave sidebands of CO₂ laser lines

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Line shapes in high-resolution optoacoustic spectroscopy

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High-information infrared spectroscopy of unstable molecules

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CO₂-laser sideband spectroscopy at ultrahigh resolution

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