Acta Optica SinicaInvestigation of Europium Atom by Two-Color Three-Photon Resonant Ionization Spectroscopy谢军 Xie Jun, 戴长建 Dai Changjian, 李鸣 Li MingPublished Jan 1, 2010• 1 citationPublisherDOI10.3788/aos20103007.2142