A double ionization satellite in the tungsten Auger spectrum

The electron induced tungsten Auger spectrum exhibits a peak at 210 eV which is on the high energy side of the major Auger emissions, N_{4, 5}N_{6, 7}X (X ≡ N_{6, 7} or O_{2, 3}). The N₄N_{6, 7}V Coster-Kronig processes should occur around 210 eV but the yield curve for the 210 eV feature shows that most of the intensity arises from a process with threshold behaviour toward N₃. This process is identified as the second step in an Auger cascade: N₃ single holes decay via an N₅V state which exhibits a high probability of decaying via a particular N_{6, 7}XV three-hole state to yield electron emission at 210 eV.