Eur. Phys. J. D 53, 289-302 (2009)
https://doi.org/10.1140/epjd/e2009-00137-2

Odd autoionizing 2p_1/2⁵n(s^′/d^′) resonances of Ne excited from the 2p⁵3p[K]_J states

¹ Rostov State University of TC, 344038 Rostov-on-Don, Russia
² Technische Universität Kaiserslautern, Postfach 3049, 67653 Kaiserslautern, Germany

Corresponding author: ^a vls@rgups.ru

Received: 20 February 2009
Revised: 25 March 2009
Published online: 1 May 2009

Abstract

Absolute photoionization cross sections for Ne atoms in the excited levels (Paschen notation ) 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 2p_1/2⁵ns^′/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 ²P_3/2 and ²P_1/2 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 2p_x levels. For the 2p₁ level the resonance structure and the partial cross sections are strongly influenced by a Cooper-Seaton minimum in the d_3/2^′ channel, located just above the ²P_1/2 ionization limit.