Erlangen 2022 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 10: XUV-spectroscopy

MO 10.6: Vortrag

Mittwoch, 16. März 2022, 11:45–12:00, MO-H6

Ultrafast photoisomerization studied by time-resolved photoelectron spectroscopy — Camilo Granados¹, Evgenii Titov², Johan Hummert¹, Evgenii Ikonnikov¹, Stefan Haacke³, Roland Mitric⁴, and •Oleg Kornilov¹ — ¹Max Born Institute, Berlin — ²Department of Chemistry, University of Potsdam — ³Institut de physique et de chimie des Matériaux, Strasbourg — ⁴Institute of Physical and Theoretical Chemistry, University of Würzburg

Ultrafast photoinduced isomerization is a fundamental process governing molecular dynamics both in biologically relevant chromophores and in functional materials. It is widely accepted that the isomerization efficiency is governed by the dynamics through conical intersections. However, the influence of the complex environments hosting the chromophores on the dynamics through the conical intersection is not fully understood. XUV time-resolved photoelectron spectroscopy (TRPES), are promising in delivering detectable signals from the regions of conical intersection. TRPES of molecular chromophores requires application of photoemission methods to the liquid phase samples (molecular solutions). By combining an ultrafast tunable XUV source with a microliquid jet sample we demonstrated liquid phase TRPES of organic molecules. In this contribution we will report on the recent results applying this method to the prototypical molecules, Methyl Orange and Metanil Yellow[2]. The experimental results are complemented by high-level TDDFT surface hopping calculations to reveal electronic state involved in ultrafast isomerization of the molecules. We will further show preliminary results for several bio-mimetic chromophores.