Lithium atoms channeled in the nodes of an intense standing-wave radiation field are cooled to near the recoil limit by adibatically reducing the radiation intensity. The final momentum distribution has a narrow component with a root-mean-squared momentum of 2ħk in one dimension, where ħk is the momentum of a radiation-field photon. The data are compared with the results of a Monte Carlo simulation using a two-level atom model. This process may be useful for cooling and increasing the phase-space density of atoms confined in a magnetic trap.
J. Chen et al., "Adiabatic Cooling of Atoms by an Intense Standing Wave," Physical Review Letters, vol. 69, no. 9, pp. 1344-1347, American Physical Society (APS), Aug 1992.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevLett.69.1344
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