Abstract
Angle-resolved photoelectron spectrometry employing synchrotron radiation is used to study oxygen atoms generated in a microwave discharge. The energy region below the 4Pe threshold associated with removal of a 2s electron is addressed. Photoionization cross sections (σ) and asymmetry parameters (β) are obtained for both the O+ (4S0), εl and O+ (2D0), εl channels and evidence for autoionizing Rydberg series with 3S0, 3P0, and 3D0 symmetries, converging to the 4Pe ionic state, is observed.
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