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Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 43: Ultrafast Dynamics III and High-harmonic Generation (joint session MO/A)

A 43.3: Talk

Friday, March 15, 2024, 15:00–15:15, HS 3044

Attosecond time-resolved coincidence spectroscopy of ethylene — •Barbara Merzuk1, David Busto1,2, Ioannis Makos1, Dominik Ertel1, Marvin Schmoll1, Benjamin Steiner1, Fabio Frassetto3, Luca Poletto3, Robert Moshammer4, Claus Dieter Schröter4, Thomas Pfeifer4, Serguei Patchkovskii5, Jakub Benda6, Zdeněk Mašín6, and Giuseppe Sansone11Albert-Ludwigs-Universität Freiburg,Germany — 2Lund University,Sweden — 3CNR,Padova,Italy — 4MPIK,Heidelberg,Germany — 5MBI Berlin,Germany — 6Charles University,Prague,Czech Republic

Studying photoionization dynamics and characterising the time delays associated with the photoemission of an electron wave packet can unveil important characteristics of coupled electronic-nuclear dynamics in molecular systems. Attosecond photoelectron spectroscopy in combination with electron-ion coincidence detection is beneficial since this allows disentangling the different photoionization and dissociation channels. Additionally, it may give access to the orientation of the molecule at the instant of photoionization. Using our experimental setup that consists of an attosecond beamline, based on high-order harmonic generation operating at 50 kHz repetition rate, we investigate the photoionization dynamics in ethylene molecules by performing RABBIT (Reconstruction of Attosecond Beating By Interference of Two-photon transitions) measurements while detecting photoelectrons and photoions in coincidence. The experimental results are interpreted with the help of multi-electron R-matrix calculations of two-photon ionization.

Keywords: High harmonics gereration; coincidence spectroscopy; ethylene; RABBIT; electron dynamics

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