Hannover 2020 – scientific programme

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MO: Fachverband Molekülphysik

MO 5: MO Poster 1

MO 5.18: Poster

Monday, March 9, 2020, 17:00–19:00, Empore Lichthof

High Repetition Rate Studies of Laser-Driven Electron Rescattering in Spatially Aligned Molecules — •Federico Branchi, Horst Rottke, Mark Mero, Marc J.J. Vrakking, and Jochen Mikosch — Max-Born-Institut, Berlin, Germany

In Laser-Induced Electron Diffraction (LIED), a valence electron in an atom or molecule tunnels through the Coulomb potential dressed by a strong laser field, is accelerated by the oscillating field of the laser and driven back to its parent, from which it can elastically rescatter. Structural information can be extracted from measured scattering angle distributions. In particular for mid-infrared lasers the energy of the returning electron can be sufficient to determine bond angles and lengths with LIED. Importantly, since LIED is phase locked to the cycle of the driving laser field, it has inherent time resolution and is hence a promising probe for molecular dynamics studies.

We have recently combined a high repetition-rate (100kHz), mid-IR (1550/3100nm), ultrashort (50fs pulse duration) laser system based on optical parametrical chirped pulse amplification (OPCPA) with a reaction microscope to investigate laser-driven electron rescattering in polyatomic molecules. Current results on laser-aligned 1,3-butadiene molecules are presented, for which coincidence measurements of electron and ion momenta allow to obtain ionization-channel resolved molecular frame information.