Branching ratios of autoionization from Eu 4f76p1/26d [J] autoionizing states

doi:10.1088/1674-1056/24/8/083203

Abstract The autoionization branching ratios from Eu 4f⁷6p_1/26d [J] autoionizing states to its 4f⁷6s⁺ (⁹S^o), 4f⁷6s⁺ (⁷S^o), and 4f⁷5d⁺ (⁹D^o) final ionic states are investigated with the combination of the three-step laser excitation and the velocity-map imaging technique. These different autoionizing states are excited via 4f⁷6s6d ⁸D_J [J = 5/2, 7/2, and 9/2] intermediate states, respectively. The experimental photoelectron images are obtained, from which energy distributions of ejected electrons are achieved with the mathematical transformation. Furthermore, the energy dependence of the branching ratio is investigated within the autoionization resonance, by which population inversion is observed as an important characteristic. The J-dependence is also studied systematically. The validity of the well-known isolated core excitation technique used for obtaining the autoionization spectrum is also studied.

Keywords: Eu atom velocity-map imaging autoionizing state autoionization branching ratio

Received: 04 January 2015
Revised: 03 March 2015
Accepted manuscript online:

PACS:	32.80.Zb	(Autoionization)
	32.30.-r	(Atomic spectra?)
	32.80.Ee	(Rydberg states)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11174218).

Corresponding Authors: Dai Chang-Jian
E-mail: daicj@126.com

Cite this article:

Yan Jun-Gang (闫俊刚), Shen Li (沈礼), Liang Hong-Rui (梁洪瑞), Dai Chang-Jian (戴长建) Branching ratios of autoionization from Eu 4f⁷6p_1/26d [J] autoionizing states 2015 Chin. Phys. B 24 083203

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Branching ratios of autoionization from Eu 4f⁷6p_1/26d [J] autoionizing states