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We report the first observation of radiation-pressure cooling on a system of resonant absorbers which are elastically bound to a laboratory fixed apparatus. Mg ii ions confined in a Penning electromagnetic trap are cooled to 40 K by irradiating them with the 8- output of a frequency doubled, single- mode dye laser tuned to the low- frequency side of the Doppler profile on the ^2S₁₂^2P₃₂ (M₉=+12M₉=+32 or M₉=-12M₉=-32) transitions. Cooling to approximately 10^-3 K should be possible.
Wineland et al. (Mon,) studied this question.