Resonant width and energy determined by photoionization from excited divalent atoms

Explicit examples are presented to illustrate the presence of a more symmetric resonant structure in spectra from bound excited states of a divalent atom. Comparison between the theoretical ground-state and bound excited-state photoelectron spectra shows that both the resonant energy Eᵣ and the resonant width {Γ} of a doubly excited autoionization state of a divalent atom (e.g., alkaline-earth-metal atom) can be determined experimentally from photoionization originated from a bound excited state more effectively.