Autoionizing even 2p(1/2)(5) nl '[ K '] (0, 1, 2)(l '=1, 3) Rydberg series of Ne: A comparison of many-electron theory and experiment

摘要

The 2p(1/2)(5)np' J = 0, 1, 2 and 2p(1/2)(5)nf' J = 2 autoionizing Rydberg states ( ARS) of Ne have been studied by two-step two-colour photoionization of ground-state neon atoms via the intermediate states 2p(3/2)(5)3s J = 1 and 2p(1/2)(5)3s' J = 1, followed by time-of-flight ion detection. Strong interference between the direct and virtual intershell photoexcitation channels in ARS production, especially for the np' J = 0 series, is revealed. The computed reduced width Gamma(r) = 6431 cm(-1) and the quantum defect mu(p) = 0.7634 of the 2p(1/2)(5)13p' J = 0 resonance agree well with the experimental results Gamma = 5334 cm(-1) and mu(p) = 0.7662 determined with a Fano-type lineshape analysis. The measured lineshapes of the np' J = 0, 1, 2 resonances are also in good agreement with the many-electron computation.