Multiple ionization of iodine for 2.5–5.0 MeV I²²⁺ ions impacting on Fe target

The L-shell X-ray emissions of iodine are investigated as a function of the incident energy for I²²⁺ ions impacting on Fe target in the energy region near the Bohr velocity. Six distinct L-subshell X-rays, Lι, Lα_{1, 2}, Lβ_{1, 3, 4}, Lβ_{2, 15}, Lγ₁ and Lγ_{2, 3, 4, 4}^', are observed. Compared to the atomic data, the energy of the experimental X ray shifts to the higher energy side. The relative intensity ratios of Lι, Lβ_{1, 3, 4}, Lβ_{2, 15}, to Lα_{1, 2}, Lι to Lβ_{2, 15} and Lγ_{2, 3, 4, 4/} to Lγ₁ are enhanced, but has no obvious change with the increase of projectile energy in the present energy region. That is interpreted by the multiple ionization effect of the M-, N- and O-shell electrons.