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Acta Optica Sinica

Investigation of Even-Parity Highly Excited States of Eu I with Electric Field Ionization Method

野仕伟 Ye Shiwei, 戴长建 Dai Changjian, 赵艳红 Zhao Yanhong

Published Jan 1, 2012• 0 citations
Publisher
DOI
10.3788/aos201232.0230001

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Chinese Journal of Luminescence•Jan 1, 2015•0 citations
The field ionization process of the Eu 4f 7 6s n p Rydberg states, converging to the first ionization limit, 4f 7 6s 9 S 4 , is systematically investigated. The spectra of the Eu 4f 7 6s n p 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 4f 7 6s n p 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 4f 7 6s n p Rydberg states with the effective quantum number is built.
The field ionization process of Eu 4f76 snp Rydberg states converging to the first ionization limit 4f76s9S4 was systematically investigated. Firstly,the spectra of Rydberg states 4f76 snp of Eu atom were measured using the three-step laser excitation and electric field ionization( EFI) method.Secondly,the EFI pulse( pulse width of 0. 2 μs) was applied after laser excitation. Then,we continuously scan field ionization voltage to observe the EFI process,and to realize the potential of field ionization we need to understand what happens to the atoms as the pulse field rises from 0 to 3 kV.The exact location of ionization threshold can be obtained when the peak of ionization field changes.Especially,above the threshold,some structures are found due to black body radiation( BBR).