Abstract
Use of optical selection of cold particles in saturated absorption spectroscopy is discussed. Owing to this we observed directly the splitting of a methane absorption line (λ=3.39 μm) due to recoil effect in a light beam of 0.5 cm in diameter. The obtained width of nonlinear resonance of about 1 kHz corresponds to an effective temperature of particles of about 10−1 K. The new direct absolute frequency measurement of the central hyperfine component of theF (2)2 line in methane (7−6 transition) made under these conditions gave the following value 88376181600.7±0.5 kHz. The behaviour of the resonance intensity of saturated absorption in the transit-time conditions is analysed. It has been shown that with an absorption cell inside a cavity the saturation resonance intensity in the transit-time region increases sharply.
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The authors thank Dr. V.M. Semibalamut for making calculations of the halfwidth of the second derivative of saltureation resonane in the transit-time region
The results were obtained together with V.F. Zakharyash, V.M. Klementyev, and B.A. Timchenko and will be discussed in detail in a forthcoming paper