Ultrahigh-resolution laser spectroscopy with cold particles
Bagaev S. N. , Baklanov A. E. , Dychkov A. S. , Pokasov P. V. , Chebotaev V. P.
The first results on the behavior of a nonlinear resonance in methane (λ — 3.39 μια) in the transit region as a function of the intensity of the saturating field are reported. The experimental results show that in weak fields the size of the derivative of the resonance, f, is determined exclusively by the homogeneous half-width Γ {γ = 1.4 Γ). The resonance forms primarily because of "cold" particles, with velocities well below the average thermal velocity. It thus becomes possible to distinguish transit broadening from the quadratic Doppler effect.
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![](/ps/1242/article_18781_800_head.png "The first results on the behavior of a nonlinear resonance in methane <i>(λ </i>— 3.39 <i>μια) </i>in the transit region as a function of the intensity of the saturating <i>field </i>are reported. The experimental results show that in weak fields the size of the derivative of the resonance, <i>f, </i>is determined exclusively by the homogeneous half-width Γ <i>{γ </i>= 1.4 Γ). The resonance forms primarily because of "cold" particles, with velocities well below the average thermal velocity. It thus becomes possible to distinguish transit broadening from the quadratic Doppler effect.")