Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 51: Interaction with VUV and X-ray light III

A 51.5: Vortrag

Freitag, 21. März 2014, 11:30–11:45, BEBEL E42

Diffraction Effects in the Molecular-Frame Photoelectron Angular Distributions of Halomethanes. — •Cedric Bomme¹, Denis Anielski^1,2, Sadia Bari¹, Benjamin Erk¹, Rebecca Boll^1,2, Evgeny Savelyev¹, Jens Kienitz¹, Nele Mueller¹, Thomas Kierspel¹, Sebastian Trippel¹, Jochen Kuepper¹, Jens Viefhaus¹, Mauro Stener³, Piero Decleva³, and Daniel Rolles¹ — ¹Deutsches Elektronen-Synchrotron(DESY), Hamburg, Germany. — ²Max-Planck-Institut f. Kernphysik, Heidelberg, Germany. — ³Universita' di Trieste, Trieste, Italy

We have measured the molecular-frame photoelectron angular distributions (MFPADs) for inner-shell photoionization of the halomethanes CH3F, CH3I, and CF3I in the gas-phase. Using our new double-sided velocity map imaging (VMI) spectrometer optimized for electron-ion coincidence measurements of high-kinetic energy electrons, we are able to determined MFPADs for photoelectrons up to 300 eV. For these high kinetic energies, the MFPADs are dominated by diffraction effects that encode information on the molecular geometry in the MFPADs.