Even-parity states of the Sm atom with stepwise excitation

doi:10.1088/1674-1056/20/6/063204

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 4f⁶6s6p⁷D_J (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).

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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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Even-parity states of the Sm atom with stepwise excitation

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