Line broadening analysis for open states: two- and three-photon spectroscopy Dorothy Koki Mringie, Kipkorir Cornelius, Geoffrey Kihara Rurimo and Ogaro Elijah Nyakang’o Eur. Phys. J. D, 79 5 (2025) 53 Published online: 16 May 2025 DOI: 10.1140/epjd/s10053-025-01004-y