An atomic beam of Li was transversely cooled using an intense standing-wave radiation field. A dramatic change in the transverse velocity distribution was observed. Structure in the resulting velocity distribution was found to be due to velocity-tuned multiphoton Doppleron resonances. The force due to seven-photon resonances is clearly resolved in the data. The data are in good agreement with theoretical predictions.
J. J. Tollett et al., "Observation of Velocity-Tuned Multiphoton Doppleron Resonances in Laser-Cooled Atoms," Physical Review Letters, vol. 65, no. 5, pp. 559-562, American Physical Society (APS), Jul 1990.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.65.559
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