Abstract
High-resolution Coster–Kronig (C–K) electron emission spectra in collisions of 32MeV O3+ ions with a He gas target have been investigated using zero-degree electron spectroscopy. Zero-degree electron spectrum for the O3+ projectiles exhibits a trident-like structure around the cusp peak, consisting of three clear peaks. The sharp peaks directly on either side of the cusp corresponded to autoionization lines from highly excited O3+ ions produced in the collision with a He gas target, which are confirmed to be due to the configuration 1s22s2p(3P)5s, where the C–K ejection energy is 0.014eV. The C–K transitions in higher energy region are found to originate in 1s22s2p(3P)nl–1s22s2εl′ (n=5–11). For n=5–7, a clear angular momentum distribution is observed, where the maximum intensity is attributed to the relatively high angular momentum l=2 or 3.
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