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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Exchange interaction effects in NO core-level photoionization cross-sections

A Rüdel1, U Hergenhahn2,4, K Maier1, E E Rennie1,5, O Kugeler1,6, J Viefhaus1, P Lin3, R R Lucchese3 and A M Bradshaw2

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The effect of the exchange interaction in the photoionization continuum is investigated, using N 1s photoionization of NO into the 1s−12π (1Π) and (3Π) final states as an example. The separation in energy of these two final states is 1.41 eV. Significant differences in their partial photoionization cross-sections are observed over a wide range of energies and cannot be accounted for by the different multiplicity of the states. We suggest that the deviation of the 3Π/1Π cross-section ratio from the statistical weighting at intermediate energies is dominated by the difference in the final-state potential experienced by the photoelectron and at asymptotically high energies by the multiplet-dependent amount of intensity going into multi-electron (shake-up) processes. Calculations underpinning this point are presented. We also show supporting measurements of the 3Π/1Π cross-section ratio for O 1s ionization and the absolute photoabsorption cross-section for NO over a wide energy range covering the core level region.


PACS

33.80.Eh Autoionization, photoionization, and photodetachment

33.60.+q Photoelectron spectra

31.15.xr Self-consistent-field methods

Subjects

Atomic and molecular physics

Computational physics

Dates

Issue 1 (September 2005)

Received 8 June 2005

Published 6 September 2005



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