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Laser cooling of trapped multilevel ions is studied numerically. The ions are assumed to be localized to spatial dimensions smaller than the optical wavelength ͑Lamb-Dicke regime͒. A master equation for the center-of-mass motion is used to numerically evaluate cooling rates and final temperatures for arbitrary light field configurations. The results show both well-known cooling mechanisms ͑Doppler cooling, sideband cool-ing͒ and effects introduced by the presence of multiple atomic levels. Quantitative results are given for a trapped Ba ϩ ion. The numerical procedure can easily be adapted for all ions used in today's trapping experiments.
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