Erlangen 2018 – scientific programme
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MO: Fachverband Molekülphysik
MO 24: Experimental Techniques
MO 24.4: Talk
Friday, March 9, 2018, 11:15–11:30, PA 2.150
Optimization of field-free alignment of molecules for imaging experiments — •Evangelos Thomas Karamatskos1,2, Sebastian Raabe3, Philipp Stammer3, Andrea Trabattoni1, Terence Mullins1, Gildas Goldsztejn3, Sebastian Trippel1,4, Arnaud Rouzée3, and Jochen Küpper1,2,4,5 — 1CFEL, DESY, Hamburg, Germany — 2Department of Physics, Universität Hamburg, Germany — 3Max-Born Institute, Berlin, Germany — 4CUI, Universität Hamburg, Germany — 5Department of Chemistry, Universität Hamburg, Germany
Field-free alignment and orientation of molecules is an important prerequisite for many gas phase imaging experiments. It allows to access information directly in the molecular frame and extract observables such as internuclear distances, angles and the electronic density through a measurement of the photoelectron angular distribution. We present new experimental results and simulations on strongly field-free aligned molecules, ranging from linear to complex asymmetric rotor molecules. Additionally, photoelectron momentum distributions of strongly aligned OCS molecules, recorded experimentally at different angles between the laser polarization axis and the molecular axis will be presented. The photoelectron angular distributions display large modifications with the molecular axis distribution, both at low and high kinetic energies, which encode the molecular structure and electronic density of the molecule. A discussion of the experimental results will be presented.