Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MO: Fachverband Molekülphysik
MO 13: Poster – Ultrafast Electronic Dynamics
MO 13.7: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG
Ultrafast Isomerization Dynamics of Amino-Azobenzene Molecules Probed by TRPES — •Alina Khodko1,4, Artem Norenko4, Matthew Mgbukwu3, Evgenii Titov2, Nataliia Kachalova4, Valerii Voitsekhovych4, Igor Dmytruk4,5, Stefan Haacke3, Oleg Kornilov1, and Jérémie Léonard3 — 1Max Born Institute, Max-Born-Straße 2A, 12489 Berlin, Germany — 2Institute of Chemistry, University of Potsdam, Germany — 3Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504, Strasbourg, France — 4Institute of Physics NAS of Ukraine, Nauky Ave, 46, 03028, Kyiv, Ukraine — 5Taras Shevchenko National University of Kyiv, 64/13 Volodymyrska St., Ukraine, 01601, Kyiv, Ukraine
To access the isomerization dynamics of azobenzenes, Metanil Yellow molecules, time-resolved photoelectron spectroscopy (TRPES) were performed using 400 nm pump and 15th harmonic (23.5 eV) probe pulses. The experimental setup has been described [1]. The excited-state signal, integrated within the range from 2.4 eV to 5.2 eV, is modeled with a bi-exponential decay function. The fit yields the constants of around 0.5 ps and 5.2 ps. In general, the timescales from the TRPES experiments are in good agreement with the results derived from the transient-absorption spectroscopy (TAS). Based on DFT calculations, the dynamics are tentatively assigned to the S2 -> S1 conversion followed by relaxation to a long-lived state, the nature of which (possibly a TICT state) remains to be confirmed. This project was supported by Laserlab (PID: 26494). 1. E. Titov, et. Faraday Discuss., 2021.
Keywords: time-resolved photoelectron spectroscopy; amino-azobenzene molecules; metanil yellow; XUV generation