SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 16: Ultrafast Electron Dynamics at Surface and Interfaces II

O 16.1: Vortrag

Montag, 27. März 2023, 15:00–15:15, TRE Phy

Time Resolved Photoemission Study of the Charge Transfer Dynamics in Rutile TiO₂(110) for CO Photooxidation to CO₂ — •Helena Gleißner^1,2,3, Michael Wagstaffe², Lukas Wenthaus⁴, Simon Chung², Steffen Palutke⁴, Siarhei Dziarzhytski⁴, Dmytro Kutnyakhov⁴, Michael Heber⁴, Günter Brenner⁴, Harald Redlin⁴, Heshmat Noei^1,2, and Andreas Stierle^1,2,3 — ¹The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany — ²Center for X-ray and Nano Science (CXNS), Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany — ³Fachbereich Physik Universität Hamburg, Hamburg, Germany — ⁴Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany

In a pump-probe experiment at the free electron laser in Hamburg (FLASH) we gained insight into the ultrafast charge transfer on rutile TiO₂(110) during CO oxidation to CO₂. Pumped with a 770 nm optical laser and probed with 643 eV FEL soft x-rays we monitored the changes in the O 1s and Ti 2p core levels on a picosecond timescale using time-resolved photoemission spectroscopy.

We find that oxygen gets activated and reacts with CO to CO₂ in 0.2 ps up to 1 ps after the laser excitation. A complementary study found that the CO oxidation on anatase TiO₂(101) takes place between 1.2 and 2.8 ps after irradiation with an ultrashort laser pulse.[1]

[1] Wagstaffe, M. et al. ACS Catal. 10, 13650-13658 (2020).