Rydberg spectra of singlet metastable states of O₂

Updated analyses of several singlet Rydberg states of O2 via spectra involving excitation from the metastable a1Δg and b1Σg+ states are presented. The high-quality FT-VUV spectra available from the DESIRS beamline at the SOLEIL synchrotron gives significantly improved spectra compared to previous work. The Rydberg states analysed include 3pπ1Σu+ v = 0–4, 3pσ1Πu v = 0–2, 3pπ1Δu v = 0–2, 4pπ1Σu+ v = 0–1, 4pσ1Πu v = 0 and 4pπ1Δu v = 0. This is...