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Berlin 2001 – wissenschaftliches Programm

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A: Atomphysik

A 18: Photoionisation II (joint session A and MO)

A 18.7: Vortrag

Freitag, 6. April 2001, 17:15–17:30, H1012

Photo- and Auger-Electron Spectroscopy on Oriented CO and N2 — •Oliver Gessner, Jens Viefhaus, Rainer Hentges, Georg Prümper, and Uwe Becker — Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin

The angular distributions of photo- und Auger-electrons emitted by CO- and N2-molecules were measured in the molecular frame in the energy region of the 1s inner shell excitation. The target molecules were not statically oriented before the photoionization took place, rather the molecular orientation was measured using a time- and position-resolved coincidence technique [1]. This method enables us to measure photoelectron angular distributions of oriented molecules and ion-emission angular distributions for selected electron emission directions simultaneously. By analysing both distributions we derived all matrix elements and phase shifts describing the C1s inner shell photoionization of CO.
While direct photoionization has to be described by dipol matrix elements, the effects of the resonant Auger-electron emission have to be explained by Coulomb matrix elements. For the first time, intramolecular Auger-electron emission distributions following the C1s-π and N1s-π excitation of free CO and N2, respectively, are presented. They will be compared with theoretical predictions and related measurements of non-resonant Auger processes.

[1] F. Heiser, O. Geßner, J. Viefhaus, K. Wieliczek, R. Hentges, and U. Becker, Phys. Rev. Lett. 79, 2435 (1997).

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