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Berlin 2001 – wissenschaftliches Programm

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MO: Molekülphysik

MO 4: Posters Tuesday: Photoionisation

MO 4.1: Poster

Dienstag, 3. April 2001, 12:30–15:00, AT3

Dynamical localisation of inner-shell core-holes in ethane and ethene isotopomers measured by photoelectron-spectroscopy — •O. Kugeler1,2, U. Hergenhahn1, A. Rüdel1,2, E.E. Rennie1, and A.M. Bradshaw11Fritz-Haber-Institut der MPG, Berlin — 2Max-Planck-Institut für Plasmaphysik, Garching

The question of localisation or delocalisation of inner-shell core-holes has not been solved entirely yet. Recent studies of the O 1s states of CO2 [1] show, that the core holes localise by excitation of an antisymmetrical molecular vibration. This mechanism is also expected to occur in the C 1 s excitation of ethane and ethene. However, in these molecules due to their small energetic difference symmetrical and antisymmetrical vibration cannot be resolved properly. Therefore additional information on the respective coupling constants was obtained by measurements of the deuterated isotopomers (C2D4, C2H2D2, C2D6, and C2H3D3) under identical experimental conditions. The spectra were fitted with different linear coupling models taking into account post-collision-interaction to yield the experimental coupling constants. In this presentation we delineate in detail how these can be connected to the degree of dynamical localisation of the core holes.
A. Kivimäki et al., Phys. Rev. Lett. 79, 998 (1997).

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