The radiative and autoionization decay channels of oxygen metastable ionic states have been investigated with beam-foil spectroscopy. Relative branching ratios of the 1s2s2p Pl/2 3/2 states of 0'+ to the J=5/2 level have been determined. Radiative and autoionization rates of the J =1/2 and 3/2 fine-structure levels are extracted by using the calculated fluorescence yield of the J =5/2 level of Chen, Crasemann, and Mark [Phys. Rev. A 27, 544 (1983)] and the measured total lifetimes corrected for cascades. The study of the delayed electron emission is extended in nitrogen and carbon ions, where transition rates of the dominating autoionization channel of the 2 Pl/, &/, states have been determined directly from the experimental lifetimes corrected for cascades.

Atoms.Molecules zo,,0o.r,, and ClustersThe delayed X-ray and electron emission from metastabte states in fast, foil excited neon ions has been investigated. High resolution X-ray and electron spectroscopy at calibrated relative detection efficiencies was applied to determine fluorescence yields for the radiative decay of the (ls2s2p)4Ps °, J = 1/2, 3/2, 5/2 states in NeVIII. Using measured total lifetimes corrected for cascading effects the forbidden radiative and autoionization rates were determined.