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-μW output of a frequency doubled, single- mode dye laser tuned to the low- frequency side of the Doppler profile on the ( or ) transitions. Cooling to approximately K should be possible.
- Received 26 April 1978
- Published in the issue dated 19 June 1978
© 1978 The American Physical Society