translate English to French: We have calculated the excitation energies and the length and velocity forms of the optical oscillator strengths for the resonance 1s22s22p63s2Se → 1s22s22p63p2P0 transition and the nonresonance 1s22s22p63s2Se → 1s22s22p64p2P0, 1s22s22p63p2P0 → 1s22s22p64s2Se and 1s22s22p64s2Se → 1s22s22p64p2P0 transitions in Na, Mg+, Al2+, Si3+, S5+, Ar7+, Ca9+, and Fe15+ systems.
Nous avons calculé les énergies d'excitation et les deux formes—forme longueur et forme vitesse—des forces d'oscillateurs optiques pour la transition de résonance 1s22s22p63d2Se → 1s22s22p63p2P0 et les transitions non résonantes 1s22s22p63d2Se → 1s22s22p64p2P0, 1s22s22p63p2P0 → 1s22s22p64s2Se et 1s22s22p64s2Se → 1s22s22p64p2P0 dans les systèmes Na, Mg+, Al2+, Si3+, S5+, Ar7+, Ca9+ et Fe15+.