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VOLUME 23 (1976) | ISSUE 7 | PAGE 399
Narrowing of nonlinear resonances in low-pressure gases
We report the first observation of the effect of narrowing of nonlinear power resonance under the influence of slow atoms. This effect has made it possible to resolve the magnetic hyperfine structure of the λ = 3.39 μ vibrational-rotational transition in methane (F2<2) component of the P(7) line of v3 band) in an He-Ne laser in which the transverse dimension of the light beam is —4 mm.