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A: Fachverband Atomphysik
A 11: Attosecond physics II
A 11.3: Vortrag
Dienstag, 10. März 2020, 14:45–15:00, f107
Molecular Frame Studies of Channel-Resolved Laser-Driven Electron Recollision — Federico Branchi1, Horst Rottke1, Mark Mero1, Marc J.J. Vrakking1, Varun Makhija2, and •Jochen Mikosch1 — 1Max-Born-Institut, Berlin, Germany — 2University of Mary Washington, Fredericksburg, USA
When a molecule interacts with a strong, infrared laser field, a number of phase-locked attosecond processes can be initiated. From the perspective of transient probing of molecular structure, Laser-Induced Electron Diffraction (LIED) is of particular recent interest. In LIED, the tunnel-ionized electron wavepacket is accelerated and driven back to the parent molecule, where it rescatters elastically. With mid-infrared driving laser fields, where the achieved electron kinetic energies are high, bond lengths and angles of molecules can be extracted from the electron scattering images, by fitting the measured differential cross section with an independent atom model.
We are particularly interested in ionization channel-resolved studies, since LIED can be performed independently with two different continuum wavepackets, on the same molecule, at the same time. Such experiments are hence very powerful in testing the way in which structural information is retrieved from the data. Current measurements on 1,3-butadiene molecules are performed in a reaction microscope, which is coupled to a 100kHz repetition rate, mid-infrared OPCPA laser system. We will report on differences we found between the rescattering associated with ground and excited state ionization continuum and on extracting three-dimensional molecular frame information.