High-charge-state formation following inner-shell photodetachment from S-

Journal article, 2005

The formation of S+, S2+, S3+, and S4+ is observed following inner-shell photodetachment of S–. The photodetachment spectra for all possible ionic products are obtained over a large region of photon energies covering both the 2p and 2s thresholds (S5+, is energetically allowed at the higher photon energies, but not observed), and are placed on an absolute scale. The 2s threshold energy is measured to be 224.6(5) eV, allowing the determination of the neutral atomic S 2s–13s23p5 inner-shell excited state energy for the first time. The S– 2s–13s23p6 2S1/2 state is observed as a Feshbach resonance 2.3(5) eV below the 2s threshold in the S+, S2+, and S3+ product channels.