The VMI study on angular distribution of ejected electrons from Eu 4f76p1/26d autoionizing states

doi:10.1088/1674-1056/24/10/103204

Abstract

The combination of a velocity mapping imaging technique and mathematical transformation is adopted to study the angular distribution of electrons ejected from the Eu 4f⁷6p_1/26dautoionizing states, which are excited with a three-step excitation scheme via different Eu 4f⁷6s6d⁸D_J(J= 5/2, 7/2, and 9/2) intermediate states. In order to determine the energy dependence of angular distribution of the ejected electrons, the anisotropic parameters are measured in the spectral profile of the 6p_1/26dautoionizing states by tuning the wavelength of the third-step laser across the ionic resonance lines of the Eu 6s⁺→6p⁺.The configuration interaction is discussed by comparing the angular distributions of ejected electrons from the different states. The present study reveals the profound variations of anisotropic parameters in the entire region of autoionization resonance, highlighting the complicated nature of the autoionization process for the lowest member of 6p_1/26d autoionization series.

Keywords: Eu atom autoionizing state angular distribution anisotropic parameter

Received: 09 March 2015
Revised: 24 April 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:

Zhang Kai (张开), Shen Li (沈礼), Dong Cheng (董程), Dai Chang-Jian (戴长建) The VMI study on angular distribution of ejected electrons from Eu 4f⁷6p_1/26d autoionizing states 2015 Chin. Phys. B 24 103204

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The VMI study on angular distribution of ejected electrons from Eu 4f76p1/26d autoionizing states

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The VMI study on angular distribution of ejected electrons from Eu 4f⁷6p_1/26d autoionizing states