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    Preliminary frequency measurement of the electric quadrupole transition in a single laser-cooled 40Ca+ ion

    The trap** and laser cooling of 40Ca+ ion on the way toward optical frequency standards have been developed. A single 40Ca+ ion is trapped in the miniature Paul trap and laser cooled by two frequency-stabilized...

    Bin Guo 郭彬, Hua Guan 管桦, Qu Liu 刘曲, Yao Huang 黃垚 in Frontiers of Physics in China (2009)