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Hyperfine Interactions

Designing an RFQ ring trap for antiproton confinement and trapping and laser cooling Mg+ ions

Xu Feng, M. Rathlev, Jeffrey Scott Hangst, Helge V. Knudsen, Michael H. Holzscheiter

Published Dec 1, 1996• 2 citations
Publisher
DOI
10.1007/bf02059935

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Proceedings of the National Academy of Sciences•Jan 1, 1983•84 citations
We have performed laser cooling of Mg+{}^{+}+ ions confined in a Penning trap. The externally produced ions were captured in flight, stored, and laser cooled. Laser-induced fluorescence was observed perpendicular to the cooling laser axis. Optical detection down to the single-ion level together with the electronic detection of the ion oscillations inside the Penning trap have been used to acquire information on the ion storage time, ion number, and ion temperature. Evidence for the formation of ion crystals has been observed. These investigations are an important prerequisite for the sympathetic cooling of simultaneously stored highly charged ions and the precision laser spectroscopy of forbidden transitions in these.
This paper presents the first sympathetic cooling of molecular ions using laser-cooled atomic ions. To this end, we developed a novel combination of sympathetic cooling and in situ mass spectroscopy that allows the use of laser-cooled atomic ions to detect sympathetically-cooled molecular ions non-destructively. We demonstrate this technique by cooling and mass-analysing ions of ultra-high-vacuum residual gas and externally introduced air in situ with less than 80 ions each, confined in a radio-frequency quadrupole (RFQ). This capability to detect and identify sympathetically-cooled molecules with potentially-high sensitivity in situ in an RFQ should be useful for molecular spectroscopy, chemical analysis and study of cold molecules and clusters.
A single Mg(+) has been successfully trapped and cooled in a small radiofrequency trap. The ion was cooled by using the radiation from a single-frequency ring dye laser whose output was doubled in frequency with an NH(4) (2)H(2)PO(4) temperature phasematched crystal; a power of about 22 muW or less was sufficient for all of the experiments. The ion temperature was estimated by a computer fit of the experimental resonance line profile; the resulting linewidth was compared to previously published Mg(+) 3(2)P(3/2) Hanle-effect linewidths. The result is a temperature of 5(-5) (+15) mK, which is lower than that attained previously.