Investigation of odd-parity Rydberg states of Eu I with autoionization detection

Abstract

Isolated-core-excitation (ICE) scheme and autoionization detection are employed to study the bound Rydberg states of europium atom. The high-lying states with odd parity have been measured using the autoionization detection method with three different excitation paths via 4f76s6p[8P5/2], 4f76s6p[8P7/2] and 4f76s6p[8P9/2] intermediate states, respectively. In this paper the spectra of bound Rydberg states of Eu atom are reported, which cover the energy regions from 36000 cm−1 to 38250 cm−1 and from 38900 cm−1 to 39500 cm−1. The study provides the information about level energy, the possible J values and relative line intensity as well as the effective principal quantum number n* for these states. This work not only confirms the previous results of many states, but also discovers 11 new Rydberg states of Eu atom.

Study of even-parity highly excited states of Eu I with a three-colour stepwise resonant excitation

“…Although there have also been some reports on the spectra of the highly excited states for the rare-earth atoms, they mainly focus on Gd and Yb atoms [14][15][16][17][18][19]. In recent years, some works on the states of the europium (Eu) atom have also been reported [2,9,[20][21][22][23][24], but most of them deal with odd-parity states. Therefore, this work will report the results of bound even-parity highly excited states of the Eu atom with the MSPI technique.…”