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)†
       
Linewidth of single-ion fluorescence signal is about 12.5 MHz and photon counts rate is up to 25000 s−1.