RT Journal Article
T1 Revealing electronic state-switching at conical intersections in alkyl iodides by ultrafast XUV transient absorption spectroscopy
A1 Chang, Kristina
A1 Reduzzi, Maurizio
A1 Wang, Han
A1 Marggi Poullaín, Sonia
A1 Kobayashi, Yuki
A1 Barreau, Lou
A1 Prendergast, David
A1 Neumark, Daniel
A1 Leone, Stephen
AB 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.
PB Nature Reseacher
SN 2041-1723
YR 2020
FD 2020
LK https://hdl.handle.net/20.500.14352/92995
UL https://hdl.handle.net/20.500.14352/92995
LA eng
NO Chang, K.F., Reduzzi, M., Wang, H. et al. Revealing electronic state-switching at conical intersections in alkyl iodides by ultrafast XUV transient absorption spectroscopy. Nat Commun 11, 4042 (2020). https://doi.org/10.1038/s41467-020-17745-w
NO National Science Foundation
NO U.S. Department of Energy
NO European Commission
DS Docta Complutense
RD 26 ene 2026