Wavelengths and energy levels of Fe VIII

The Fe VIII (Fe7+) spectrum has been investigated in the 35-200 nm wavelength region. The radiation emission following slow ion-atom collisions has been observed for the collision system Fe8+ + T (T He or Ar) at the Fe8+ energy 80keV. Twelve new transitions from different excited states in Fe VIII were identified. New energy levels of Fe VIII have been established from the transitions. The analysis was supported by Hartree-Fock calculations.