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 Busto^1,2, 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 Sansone¹ — ¹Albert-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