Precision spectroscopy with a single 40Ca+ ion in a Paul trap*
Guan Huaa),b), Huang Yaoa),b), Liu Pei-Lianga),b), Bian Wua),b),c), Shao Hua),b),c), Gao Ke-Lina),b)†
       
Frequency measurement of the 4s2S1/2–3d2D5/2 transition of a laser-cooled trapped single 40Ca+ ion with reference to the H-maser. Data shown in this figure do not include systematic corrections.