Hannover 2003 – wissenschaftliches Programm
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MO: Molekülphysik
MO 8: Photoelektronenspektroskopie, Photodissoziation
MO 8.6: Vortrag
Donnerstag, 27. März 2003, 15:15–15:30, B 305
Photoelectron - Auger-electron coincidence measurements in N2O K-shell photoionisation — •Oliver Kugeler1, Simon Marburger1,2, and Uwe Hergenhahn1,2 — 1FHI-Berlin, Faradayweg 4-6, D-14195 Berlin — 2MPI für Plasmaphysik, Boltzmannstraße 2, D-85748 Garching
N2O is a linear molecule consisting of a central nitrogen atom (NC) which is bound to an oxygen atom at one side and a second nitrogen, the terminal (NT) at the other side. Due to the high electronegativity of the oxygen electrons at the central N are bound more tightly than those of the terminal N - they experience a chemical shift of 4 eV. Exposure of an N2O gas target to synchrotron radiation above threshold leads to the emission of a photoelectron and a subsequent Auger electron. Aim of the presented experiment was to distinguish between Auger electrons originating from the creation of a NC and a NT core hole. This was done at the UE56/2 beamline of BESSY II in multibunch mode of operation, using a time-resolving hemispherical electron analyzer for the Auger electrons in coincidence with a time-of-flight detector for the photoelectrons.