Y. Lu, R. Tang, X. Fu, and C. Ning, Measurement of the electron affinity of the lanthanum atom, Phys. Rev. A, vol.99, p.62507, 2019.

C. W. Walter, N. D. Gibson, D. J. Matyas, C. Crocker, K. A. Dungan et al., Candidate for laser cooling of a negative ion: observations of bound-bound transitions in La ?, Phys. Rev. Lett, vol.113, p.63001, 2014.

W. Ritz, ber ein neues Gesetz der Serienspektren, Phys. Z, vol.9, p.521, 1908.

L. J. Radziemski, K. J. Fisher, D. W. Steinhaus, and A. S. Goldman, Calculation of atomic energy level values, Comp. Phys. Comm, vol.3, p.9, 1972.

A. Kramida, The program LOPT for least-squares optimization of energy levels, Comp. Phys. Comm, vol.182, p.419, 2011.

R. J. Peláez, C. Blondel, M. Vandevraye, C. Drag, and C. Delsart, Photodetachment microscopy to an excited spectral term and the electron affinity of phosphorus, J. Phys. B: At

, Mol. Opt. Phys, vol.44, p.195009, 2011.

A. Kramida, Y. Ralchenko, J. Reader, and . Team, NIST Atomic Spectra Database (ver. 5.6.1) (National Institute of Standards and Technology, 2018.

A. Kellerbauer, G. Cerchiari, E. Jordan, and C. W. Walter, High-resolution laser spectroscopy on bound-bound transitions in La ?, Physica Scripta, vol.90, p.54014, 2015.

E. Jordan, G. Cerchiari, S. Fritzsche, and A. Kellerbauer, High-resolution spectroscopy on the laser-cooling candidate La ?, Phys. Rev. Lett, vol.115, p.113001, 2015.

G. Cerchiari, A. Kellerbauer, M. Safronova, U. Safronova, and P. Yzombard, Ultracold anions for high-precision antihydrogen experiments, Phys. Rev. Lett, vol.120, p.133205, 2018.