Mapping Complex Photochemical Reactions Using Femtosecond Uv-pump Xuv-probe Photoelectron Spectroscopy

Horke, Daniel

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https://hdl.handle.net/2142/116742 Copy

Description

Title

Mapping Complex Photochemical Reactions Using Femtosecond Uv-pump Xuv-probe Photoelectron Spectroscopy

Author(s)

Horke, Daniel

Contributor(s)

Abma, Grite L.

Issue Date

2022-06-21

Keyword(s)

Mini-symposium: Spectroscopy meets Chemical Dynamics

Abstract

\begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.25]{HHG_TRPES.eps} \caption{Time-resolved photoelectron spectroscopy of \chem{CS_2} dissociation. XUV probe pulses allow us to map all intermediate and final states.} \end{wrapfigure} Time-resolved photoelectron spectroscopy has emerged as one of the premier tools to study the complex coupled motion of electrons and nuclei that underlies ultrafast photochemical processes. To study the entire reaction pathway from reactants through intermediates to products, however, requires sufficiently energetic photons to ionise all species involved. The advent of high-flux high-harmonic generation sources now puts this within reach, and we present here femtosecond photoelectron spectroscopy studies using UV-pump XUV-probe pulses. We used this approach to probe the dynamics of dissociating \chem{CS_2} molecules across the entire reaction pathway upon excitation, Figure 1. Dissociation occurs either in the initially excited singlet manifold or, via intersystem crossing, in the triplet manifold. Both product channels are monitored and we show that, despite being more rapid, the singlet dissociation is the minor product and that triplet state products dominate the final yield. We will also show first results of our recent UV-pump XUV-probe studies of acetaldehyde photodissociation and aim to unravel the complex competing direct and roaming dissociation channels.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116742&&

DOI

https://doi.org/10.15278/isms.2022.TA06

Copyright and License Information

Copyright 2022 held by the authors

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