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Chin. Phys. B, 2011, Vol. 20(6): 063204    DOI: 10.1088/1674-1056/20/6/063204
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Even-parity states of the Sm atom with stepwise excitation

Li Ming(李鸣)a)b), Dai Chang-Jian(戴长建)a)b)†, and Xie Jun(谢军)a)b)
Key Laboratory of Display Materials and Photoelectric Devices of Ministry of Education, Tianjin 300384, China; School of Science, Tianjin University of Technology, Tianjin 300384, China
Abstract  Two-colour stepwise excitation and photoionization schemes are adopted to study the spectra of high-lying states of the Sm atom. These bound even-parity states are excited with three different excitation paths from the 4f66s6p7DJ (J=1, 2, 3) intermediate states, respectively. They are probed by photoionization process with an extra photon driving them to the continuum states. In this experiment, 270 states are detected in an energy range from 36160 cm-1 to 42250 cm-1, 109 of which are newly discovered, while the rest of them are confirmed to be the energy levels reported previously. Furthermore, based on the J-momentum selection rules of three excitation paths, a unique assignment of J-momentum for all observed states is determined, eliminating all remaining ambiguities in the literature. Finally, 53 single-colour transitions originating from the scanning laser are also identified. For all the relevant transitions, the information about their relative intensities is also given in the paper.
Keywords:  stepwise excitation      Sm atom      even-parity      high-lying states  
Received:  25 February 2010      Revised:  20 January 2011      Accepted manuscript online: 
PACS:  32.80.Fb (Photoionization of atoms and ions)  
  32.30.Jc (Visible and ultraviolet spectra)  
  32.70.Fw (Absolute and relative intensities)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10574098 and 10674102) and the Natural Science Foundation of Tianjin, China (Grant No. 05YFJMJC05200).

Cite this article: 

Li Ming(李鸣), Dai Chang-Jian(戴长建), and Xie Jun(谢军) Even-parity states of the Sm atom with stepwise excitation 2011 Chin. Phys. B 20 063204

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