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)†
       
(a) Ten measurements of λ | m j |=1/2 (black squares). (b) Ten measurements of λ | m j |=3/2 (blue triangles) under the same conditions with λ | m j |=1/2. The errors indicated are the statistical errors of the measurements. The solid circle spots and the solid purple triangle indicate the weighted mean, and the errors are obtained from the weighted average of statistical errors.