Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 18: Photoionisation II (joint session A and MO)
A 18.4: Vortrag
Freitag, 6. April 2001, 16:30–16:45, H1012
Symmetry-selective observation of the N 1s shape-resonance in N2 — •Emma E. Rennie1,2, Uwe Hergenhahn1,2, Oliver Kugeler1,2, Andy Rüdel1, and Alex M. Bradshaw2 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin — 2Max-Planck-Institut für Plasmaphysik, Garching
The N 1s photoelectron spectrum of gaseous nitrogen was measured with an apparatus resolution sufficient to spectroscopically separate the two N 1s (1σ) components of gerade and ungerade symmetry. The selective amplification of the gerade component on the σ shape-resonance was clearly observed. This corroborates the assignment of this resonance as 3σu*. The observed value for the energy difference beween the two states is 97(3) meV. By that, a description of the remaining N2+ 1s vacancy states as delocalized over both atomic nuclei appears to be a better approximation to the true states than the localized description often chosen a priori.