From two excitation schemes with different intermediate states, 5d6d 1P1 and 5d6d 3F2, the La+ Rydberg series converging to La2+ ground state 5d 2D3/2 were observed. The ionization threshold of La+ was found to be 90212.8±0.5 cm−1. The autoionization Rydberg series converging to the La2+ 5d 2D5/2 state were also obtained.
© 1999 Optical Society of America
X. P. Xie, C. B. Xu, W. Sun, P. Xue, Z. P. Zhong, W. Huang, and X. Y. Xu, "Study of La+ Rydberg and autoionization states: ionization potential of LaII," J. Opt. Soc. Am. B 16, 484-487 (1999)