Odd autoionizing 2p1/25n(s′/d′) resonances of Ne excited from the 2p53p[K]J states

Absolute photoionization cross sections for Ne atoms in the excited \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$2{p}^{5}3{p}[K]_{J}~(J=0\!\!-\!\!3)$\end{document} levels (Paschen notation \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$2{p}_{x},~x=1\!\!-\!\!10$\end{document}) were calculated at near threshold energies within the configuration interaction Pauli-Fock approach including core polarization. The computed spectra and the lineshape parameters of the odd parity 2p1/25ns′/d′ autoionizing resonances are found to be in good agreement with high resolution laser spectroscopic results. Guided by the theoretical results, improved analyses of the measured spectra by superimposed Fano-type profiles were achieved. Theoretical predictions are presented for resonances which have not yet been studied experimentally. In addition, we report the absolute partial photoionization cross sections for the 2P3/2 and 2P1/2 channel at photoelectron energies up to 7 eV. Except for the highest lying 2p1(1S0) level, these cross sections monotonically decrease with energy (as reported earlier in single-electron calculations for the Ne(2p53p) configuration) with branching ratios which essentially reflect the core composition of the 2px levels. For the 2p1 level the resonance structure and the partial cross sections are strongly influenced by a Cooper-Seaton minimum in the d3/2′ channel,located just above the 2P1/2 ionization limit.