EUV photoabsorption spectrum of N-like fluorine using dual laser plasma technique

Employing the dual laser plasma technique, we measured the extreme ultraviolet (EUV) photoabsorption spectrum of F2+ ions, spanning the energy range from 53 to 93 eV with an energy resolution (E/ΔE) of 866. The measured spectrum is carefully analyzed by comparing with the available reference data and theoretical calculation using the Cowan code. We identify prominent transitions to the Rydberg series 2s22p2ns/nd and 2s2p3np from the ground level and remarkable transitions to the 2s22p2(1D)nd2D states from the 2s22p32D metastable level. Transition energies and line profile parameters are determined by fitting the identified absorption features. The calibration of the spectrometer with well-known transitions allows us to provide line positions for well-resolved resonances with an uncertainty of 20 meV. The reported experimental data of F2+ significantly contribute to the fundamental atomic database, offering valuable benchmarks for theoretical calculations with potential applications in astrophysics and plasma sciences.