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Monitoring the evolution of relative product populations at early times during a photochemical reaction

Joao P.F. Nunes, Lea-Maria Ibele, Shashank Pathak, Andrew R. Attar, Surjendu Bhattacharyya, Rebecca Boll, Kurtis D Borne, Martin Centurion, Benjamin Erk, Ming-Fu Lin, Ruaridh J G Forbes, Nathan Goff, Christopher S Hansen, Matthias Hoffmann, David M P Holland, Rebecca A Ingle, Duan Luo, Sri Bhavya Muvva, Alex Reid, Arnaud RouzeeArtem Rudenko, Sajib K Saha, Xiao Z Shen, Anbu S Venkatachalam, Xi J Wang, Matt R Ware, Stephen P. Weathersby, Kyle Wilkin, Thomas J A Wolf, Yan W Xiong, Jie Yang, Michael N R Ashfold*, Daniel Rolles*, Basile F E Curchod*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

18 Citations (Scopus)

Abstract

Identifying multiple rival reaction products and transient species formed during ultrafast photochemical reactions and determining their time-evolving relative populations are key steps toward understanding and predicting photochemical outcomes. Yet, most contemporary ultrafast studies struggle with clearly identifying and quantifying competing molecular structures/species among the emerging reaction products. Here, we show that mega-electronvolt ultrafast electron diffraction in combination with ab initio molecular dynamics calculations offer a powerful route to determining time-resolved populations of the various isomeric products formed after UV (266 nm) excitation of the five-membered heterocyclic molecule 2(5H)-thiophenone. This strategy provides experimental validation of the predicted high (∼50%) yield of an episulfide isomer containing a strained three-membered ring within ∼1 ps of photoexcitation and highlights the rapidity of interconversion between the rival highly vibrationally excited photoproducts in their ground electronic state.
Original languageEnglish
Pages (from-to)4134–4143
Number of pages10
JournalJournal of the American Chemical Society
Volume146
Issue number6
Early online date6 Feb 2024
DOIs
Publication statusPublished - 14 Feb 2024

Bibliographical note

Funding Information:
The SLAC MeV-UED facility is operated as part of the Linac Coherent Light Source at the SLAC National Accelerator Laboratory, supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. Other authors are funded through National Science Foundation grant PHYS1753324 (AV, DR); Chemical Sciences, Geosciences, and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy (M.R.W., T.J.A.W.), under grant nos. DE-FG02-86ER13491 (S.P., A.R.), DE-SC0019451 (K.B.), DE-SC0020276 (S.B.), DE-SC0017995 (N.G.), and DE-SC0020276 (J.P.F.N., S.K.S., M.C.); Engineering and Physical Sciences Research Council grant nos. EP/L005913/1 (M.N.R.A.), EP/V026690/1 (B.F.E.C.), EP/X026973/1 (B.F.E.C.), and EP/R513039/1 (L.M.I.); ANR Q-DeLight project, Grant No. ANR-20-CE29-0014 of the French Agence Nationale de la Recherche (L.M.I.); Australian Research Council grant no. DE200100549 (C.S.H.); European Union Horizon 2020 research and innovation program grant no. 803718 (B.F.E.C.); and Science and Technology Facilities Council (D.M.P.H.).

Publisher Copyright:
© 2024 The Authors.

Research Groups and Themes

  • Physical & Theoretical

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