Abstract
The results are first reported of investigations of the behaviour of a nonlinear resonance in methane at 3. 39 μm in the transit region depending on the saturating field intensity. It has been shown experimentally that with small fields the size of the resonance derivative \( \tilde \gamma \) is determined only by a homogeneous halfwidth \( \Gamma \left( {\tilde \gamma {\text{ = 1}}{\text{.4}}\Gamma } \right) \). The main contribution to resonance formation is provided by “cold” particles whose velocities are much less than an average thermal one. This permits elimination of the influence of transit broadening and of the second-order Doppler effect.
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Bagayev, S.N., Baklanov, A.E., Chebotayev, V.P., Dychkov, A.S., Pokasov, P.V. (1987). Superhigh Resolution Laser Spectroscopy with Cold Particles. In: Persson, W., Svanberg, S. (eds) Laser Spectroscopy VIII. Springer Series in Optical Sciences, vol 55. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-47973-4_25
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DOI: https://doi.org/10.1007/978-3-540-47973-4_25
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