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Chinese Journal of Luminescence

Study of Odd-parity States of Eu Atom with Two-photon Ionization Detection Technique

徐亚伟 XU Ya-wei, Shen Li, 戴长建 DAI Chang-jian

Published Jan 1, 2019• 0 citations
Publisher
DOI
10.3788/fgxb20194001.0052

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Journal of Physics B Atomic Molecular and Optical Physics•Dec 16, 2010•6 citations
In this paper, two different detection methods, photoionization and autoionization, are combined to study the spectrum of highly excited states of Eu atom. On the one hand, the bound Eu spectrum with odd-parity in the region of 43927—45010 cm-1 has been measured. The spectral information, such as position and intensity, of 32 transitions can be deduced from the spectra with calibration and the error estimation. The information of excitation process and the selection rules enables us to determine their total angular momenta. Comparison with the related literature show that 12 of the states are newly discovered. On the other hand, we design an effective method to identify different types of highly excited states. The spectra of odd-parity states in the same region are measured by both photoionization and autoionization methods, from which we may separate the Rydberg states from the valence states. of the 32 transitions only 14 can be identified as Rydberg states, and the others are valence states. Furthermore, the effective quantum numbers of the Rydberg states are also discussed in detail with the quantum theory.
Even-parity highly excited states of an europium (Eu) atom have been investigated by employing the three-colour stepwise resonant excitation technique. Seventy-eight even-parity states of the Eu atom have been detected in the energy region between 43 500 and 45 200 cm −1 with two different excitation schemes. With a detailed analysis of the experimental data, this work not only confirms or improves the previous results by determining their level energy, J assignment, but also reports 21 new states of the Eu atom with a unique J assignment. In addition, the information about relative line intensities of these 78 related transitions are also provided for the first time.