Time-Resolved Probing of the Iodobenzene C-Band Using XUV-Induced Electron Transfer Dynamics.
James Unwin1, Weronika O Razmus2, Felix Allum3,4
1Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford OX1 3TA, United Kingdom.
ACS Physical Chemistry Au
|December 5, 2024
Summary
Investigating iodobenzene photodissociation using time-resolved extreme ultraviolet spectroscopy revealed two distinct electron transfer dynamics. This identified electronic states of phenyl fragments and their corresponding neutral photochemistry pathways.
Area of Science:
- Physical Chemistry
- Chemical Physics
- Spectroscopy
Background:
- Iodobenzene photodissociation is crucial for understanding molecular dynamics.
- Previous theoretical work has laid groundwork for analyzing fragmentation pathways.
Purpose of the Study:
- To investigate the photodissociation dynamics of iodobenzene in the C-band.
- To identify electronic states of phenyl fragments and their corresponding neutral photochemistry.
Main Methods:
- Time-resolved extreme ultraviolet (XUV) spectroscopy.
- Photolysis of iodobenzene at 200 nm.
- Global fitting method for isolating product channels.
Main Results:
- Two distinct product channels were observed and characterized.
- Electron transfer dynamics were assigned to site-selective ionization of iodine photoproducts.
- Branching ratio determined: 87% ground-state phenyl (Ph(X)) and 13% excited-state phenyl (Ph(A)).
Conclusions:
- Neutral photochemistry pathways were assigned to specific electronic states.
- Energy deposited into internal phenyl modes was quantified for each channel.
- Identified distinct electron transfer dynamics governing iodobenzene dissociation.
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