Field ionization process of Eu 4f76snp Rydberg states

doi:10.1088/1674-1056/24/11/113201

Abstract

The field ionization process of the Eu 4f⁷6snp Rydberg states, converging to the first ionization limit, 4f⁷6s ⁹S₄, is systematically investigated. The spectra of the Eu 4f⁷6snp Rydberg states are populated with three-step laser excitation, and detected by electric field ionization (EFI) method. Two different kinds of the EFI pulses are applied after laser excitation to observe the possible impacts on the EFI process. The exact EFI ionization thresholds for the 4f⁷6snp Rydberg states can be determined by observing the corresponding EFI spectra. In particular, some structures above the EFI threshold are found in the EFI spectra, which may be interpreted as the effect from black body radiation (BBR). Finally, the scaling law of the EFI threshold for the Eu 4f⁷6snp Rydberg states with the effective quantum number is built.

Keywords: Eu atom Rydberg state field ionization ionization threshold

Received: 26 March 2015
Revised: 02 June 2015
Accepted manuscript online:

PACS:	32.30.Jc	(Visible and ultraviolet spectra)
	32.80.Ee	(Rydberg states)
	32.60.+i	(Zeeman and Stark effects)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11004151 and 11174218).

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

Cite this article:

Zhang Jing (张婧), Shen Li (沈礼), Dai Chang-Jian (戴长建) Field ionization process of Eu 4f⁷6snp Rydberg states 2015 Chin. Phys. B 24 113201

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Field ionization process of Eu 4f⁷6snp Rydberg states