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Japanese Journal of Applied Physics

Motional Resonances of Sympathetically Cooled ^ Ca^+, Zn^+, or Ga^+ Ions in a Linear Paul Trap : Atoms, Molecules, and Chemical Physics

Yoshiki Kai, Kenji Toyoda, Masayoshi Watanabe, Shinji Urabe

Published Aug 15, 2001• 0 citations
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44Ca+, Zn+, or Ga+ ions are sympathetically cooled by Coulomb interaction with laser-cooled 40Ca+ ions, and motional resonances of these ions are observed by monitoring the fluorescence of the 40Ca+ ions. In the experiment of sympathetic cooling of 44Ca+, the ratio of the decrease in the fluorescence signal at the motional resonance of the sympathetically cooled species to that at the motional resonance of the laser-cooled species is almost proportional to the number ratio of the two species. In the case of Ga+ ions as the sympathetically cooled species, the change in the response of sympathetically cooled species becomes larger as the temperature of the ion cloud decreases. Crystallization of an ion cloud which contains both 40Ca+ and Zn+ (or Ga+) is observed.

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The 7 Li + ion is one of the most important candidates for verifying QED theory and obtaining the precise value of the fine-structure constant α. However, direct laser cooling of trapped Li + ions will lead to strong background fluorescence which will influence the spectrum detection. The sympathetic cooling technique is a good choice to solve the problem. In this work, we report sympathetic cooling of 7 Li + ions to few mK using 40 Ca + ions in a linear Paul trap. A mixed ion crystal of 40 Ca + ions and 7 Li + ions are obtained. We also analyze the motion frequency spectra of pure 40 Ca + ions and mixed ions.

Chinese Physics Letters•Aug 1, 2015•6 citations
44Ca+, Zn+, or Ga+ ions are sympathetically cooled by Coulomb interaction with laser-cooled 40Ca+ ions, and motional resonances of these ions are observed by monitoring the fluorescence of the 40Ca+ ions. In the experiment of sympathetic cooling of 44Ca+, the ratio of the decrease in the fluorescence signal at the motional resonance of the sympathetically cooled species to that at the motional resonance of the laser-cooled species is almost proportional to the number ratio of the two species. In the case of Ga+ ions as the sympathetically cooled species, the change in the response of sympathetically cooled species becomes larger as the temperature of the ion cloud decreases. Crystallization of an ion cloud which contains both 40Ca+ and Zn+ (or Ga+) is observed.
The 7 Li + ion is one of the most important candidates for verifying QED theory and obtaining the precise value of the fine-structure constant α. However, direct laser cooling of trapped Li + ions will lead to strong background fluorescence which will influence the spectrum detection. The sympathetic cooling technique is a good choice to solve the problem. In this work, we report sympathetic cooling of 7 Li + ions to few mK using 40 Ca + ions in a linear Paul trap. A mixed ion crystal of 40 Ca + ions and 7 Li + ions are obtained. We also analyze the motion frequency spectra of pure 40 Ca + ions and mixed ions.