Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 32: Molecules in Intense Laser Fields (joint session MO/A)
A 32.6: Vortrag
Mittwoch, 7. März 2018, 15:30–15:45, PA 2.150
Probing electronic structure via molecular-frame photoelectron imaging — •Joss Wiese1, Sebastian Trippel1, and Jochen Küpper1,2,3 — 1Center for Free-Electron Laser Science, DESY, Hamburg — 2The Hamburg Center for Ultrafast Imaging, Hamburg — 3Department of Physics, University of Hamburg
Chemical function arises from the interplay of valence electrons and a view at the evolution of the highest occupied molecular orbitals (HOMOs) during a chemical reaction promises direct insight into the fundamentals of chemistry. For this purpose we employ tomographic photoelectron imaging [1] of spatially confined ensembles of indole strong-field ionized by intense near-infrared laser pulses. Reconstructed static three-dimensional photoelectron distributions in molecular-frame momentum space (MF-ARPES) will be presented. These exhibit distinct manifestations of tunneling as well as multiphoton ionization, which allow for the mapping of the molecule’s electronic structure. The technique yields experimental access to properties of the HOMO potential energy surface that are commonly only approachable through quantum chemistry. Based on the measured photoelectron distributions the importance of resonant electronic states for the tunneling ionization pathway will be enquired and the validity of molecular strong-field ionization models will be tested.
[1] Maurer, Dimitrovski, Christensen, Madsen, Stapelfeldt, Phys. Rev. Lett. 109, 123001 (2012)