Author
Listed:
- Kristina F. Chang
(University of California)
- Maurizio Reduzzi
(University of California)
- Han Wang
(Lawrence Berkeley National Laboratory)
- Sonia M. Poullain
(University of California
Universidad Complutense de Madrid)
- Yuki Kobayashi
(University of California)
- Lou Barreau
(University of California
Lawrence Berkeley National Laboratory)
- David Prendergast
(Lawrence Berkeley National Laboratory
Lawrence Berkeley National Laboratory)
- Daniel M. Neumark
(University of California
Lawrence Berkeley National Laboratory)
- Stephen R. Leone
(University of California
Lawrence Berkeley National Laboratory
University of California)
Abstract
Conical intersections between electronic states often dictate the chemistry of photoexcited molecules. Recently developed sources of ultrashort extreme ultraviolet (XUV) pulses tuned to element-specific transitions in molecules allow for the unambiguous detection of electronic state-switching at a conical intersection. Here, the fragmentation of photoexcited iso-propyl iodide and tert-butyl iodide molecules (i-C3H7I and t-C4H9I) through a conical intersection between 3Q0/1Q1 spin–orbit states is revealed by ultrafast XUV transient absorption measuring iodine 4d core-to-valence transitions. The electronic state-sensitivity of the technique allows for a complete mapping of molecular dissociation from photoexcitation to photoproducts. In both molecules, the sub-100 fs transfer of a photoexcited wave packet from the 3Q0 state into the 1Q1 state at the conical intersection is captured. The results show how differences in the electronic state-switching of the wave packet in i-C3H7I and t-C4H9I directly lead to differences in the photoproduct branching ratio of the two systems.
Suggested Citation
Kristina F. Chang & Maurizio Reduzzi & Han Wang & Sonia M. Poullain & Yuki Kobayashi & Lou Barreau & David Prendergast & Daniel M. Neumark & Stephen R. Leone, 2020.
"Revealing electronic state-switching at conical intersections in alkyl iodides by ultrafast XUV transient absorption spectroscopy,"
Nature Communications, Nature, vol. 11(1), pages 1-7, December.
Handle:
RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-17745-w
DOI: 10.1038/s41467-020-17745-w
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