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Observation of single collisionally cooled trapped ions in a buffer gas
Individual Ba ions are trapped in a gas-filled linear ion trap and observed with a high signal-to-noise ratio by resonance fluorescence. Single-ion storage times of ∼5min (∼1min) are achieved using He (Ar) as a buffer gas at pressures in the range 8×10−5–4×10−3torr. Trap dynamics in buffer gases are experimentally studied …