Freiburg 2024 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 18: Attosecond Physics II / Interaction with VUV and X-ray Light (joint session A/MO)

A 18.1: Hauptvortrag

Mittwoch, 13. März 2024, 11:00–11:30, HS 1010

Attosecond photoionization dynamics in CO₂ using coincidence spectroscopy — •Ioannis Makos¹, David Busto^1,2, Dominik Ertel¹, Jakub Benda³, Barbara Merzuk1¹, Fabio Frassetto⁴, Luca Poletto⁴, Claus Dieter Schröter⁵, Thomas Pfeifer⁵, Zdeněk Mašín³, Serguei Patchkovskii⁶, and Giuseppe Sansone¹ — ¹Albert-Ludwigs-Universität Freiburg, Germany — ²Lund University, Sweden — ³Charles University, Prague, Czech Republic — ⁴IFN-CNR, Padova, Italy — ⁵MPIK, Heidelberg, Germany — ⁶MBI, Berlin, Germany

Attosecond photoelectron interferometry is used to investigate molecular dynamics upon photoionization, revealing electron correlation effects and electron-nuclear motions interplay. Combining two-color interferometric methods with photoelectron-photoion coincidence spectroscopy enables angle-resolved studies in the recoil frame, providing insights into molecular potential anisotropy. In our study, we investigate carbon dioxide photoionization dynamics using attosecond coincidence spectroscopy. Absorption of an extreme ultraviolet photon, provided by an attosecond pulse train, leads to a superposition of cationic states, coupled to the photoelectron wave packet. Additional infrared photon absorption or emission forms a two-color photoelectron spectrogram. Our work presents CO₂ photoionization time delays, considering the impact of field-induced coupling of ionization channels. Furthermore, we show time-resolved photoelectron angular distributions in the recoil frame by measuring ejected electrons in coincidence with O⁺ dissociation fragments.

Keywords: Attosecond photoelectron interferometry; Coincidense spectroscopy; CO2 photoionization dynamics