Heidelberg 2015 – scientific programme
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A: Fachverband Atomphysik
A 28: Poster: Interaction with VUV and X-ray light II
A 28.7: Poster
Wednesday, March 25, 2015, 17:00–19:00, C/Foyer
Diffraction effects in the Recoil-Frame Photoelectron Angular Distributions of Halomethanes. — •Cédric Bomme1, Denis Anielski1,2, Evgeny Saveleyv1, Rebecca Boll1, Benjamin Erk1, Sadia Bari3, Jens Kienitz1,2, Nele Mueller1, Thomas Kierspiel1,4, Sebastian Trippel1, Jens Viefhaus1, Jochen Kuepper1,4, Mauro Stener5, Piero Decleva5, and Daniel Rolles1,6 — 1Deutsches Electronen-Synchrotron(DESY), Hamburg, Germany. — 2Max-Planck-Institut f. Kernphysik, Heidelberg, Germany. — 3European XFEL GmbH, Hamburg, Germany. — 4Hamburg Center for Ultrafast Imaging, University of Hamburg, Germany. — 5Universita’ di Trieste, Trieste, Italy. — 6Kansas State University, Manhattan, KS, USA.
We have measured the recoil frame photoelectron angular distributions (RF-PADs) for inner-shell photoionization of the halomethanes CH3F, CH3I, ClCH2I 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 RF-PADs for photoelectrons up to 300 eV. For these high kinetic energies, the RF-PADs are dominated by diffraction effects that encode information on the molecular geometry in the RF-PADs.