Phys. Rev. A 66, 022508 (2002) [4 pages]Double and triple excitations near the K-shell ionization threshold of N2 revealed by symmetry-resolved spectroscopyReceived 7 November 2001; published 28 August 2002 High-resolution photoion yield spectra of N2 are measured near the K-shell ionization threshold. Previously unresolved multiple excitations are distinguished in the Σ- and Π-symmetry-resolved spectra, which were obtained from the ion yield spectra recorded at 0° and 90° relative to the polarization direction. The three 1Πu and two 1Σu+ doubly excited states are clearly identified. Furthermore, a weak Π-symmetry feature just at the σ*-shape resonance position (∼419 eV) is definitely resolved and assigned to the lowest 1Πu triple excitation with the help of quantum chemical calculations. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.66.022508
DOI:
10.1103/PhysRevA.66.022508
PACS:
33.70.-w, 31.15.Ar, 33.80.Gj, 33.90.+h
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