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Longetti L, Barillot TR, Puppin M, Ojeda J, Poletto L, van Mourik F, Arrell CA, Chergui M. Ultrafast photoelectron spectroscopy of photoexcited aqueous ferrioxalate. Phys Chem Chem Phys 2021; 23:25308-25316. [PMID: 34747432 DOI: 10.1039/d1cp02872c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photochemistry of metal-organic compounds in solution is determined by both intra- and inter-molecular relaxation processes after photoexcitation. Understanding its prime mechanisms is crucial to optimise the reactive paths and control their outcome. Here we investigate the photoinduced dynamics of aqueous ferrioxalate ([FeIII(C2O4)3]3-) upon 263 nm excitation using ultrafast liquid phase photoelectron spectroscopy (PES). The initial step is found to be a ligand-to-metal electron transfer, occuring on a time scale faster than our time resolution (≲30 fs). Furthermore, we observe that about 25% of the initially formed ferrous species population are lost in ∼2 ps. Cast in the contest of previous ultrafast infrared and X-ray spectroscopic studies, we suggest that upon prompt photoreduction of the metal centre, the excited molecules dissociate in <140 fs into the pair of CO2 and [(CO2)FeII(C2O4)2]3- fragments, with unity quantum yield. About 25% of these pairs geminately recombine in ∼2 ps, due to interaction with the solvent molecules, reforming the ground state of the parent ferric molecule.
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Affiliation(s)
- L Longetti
- Laboratory of Ultrafast Spectroscopy and the Lausanne Centre for Ultrafast Science, ISIC, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
| | - T R Barillot
- Laboratory of Ultrafast Spectroscopy and the Lausanne Centre for Ultrafast Science, ISIC, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
| | - M Puppin
- Laboratory of Ultrafast Spectroscopy and the Lausanne Centre for Ultrafast Science, ISIC, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
| | - J Ojeda
- Laboratory of Ultrafast Spectroscopy and the Lausanne Centre for Ultrafast Science, ISIC, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
| | - L Poletto
- National Research Council of Italy - Institute of Photonics and Nanotechnologies (CNR-IFN), via Trasea 7, 35131 Padova, Italy
| | - F van Mourik
- Laboratory of Ultrafast Spectroscopy and the Lausanne Centre for Ultrafast Science, ISIC, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
| | - C A Arrell
- Laboratory of Ultrafast Spectroscopy and the Lausanne Centre for Ultrafast Science, ISIC, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
| | - M Chergui
- Laboratory of Ultrafast Spectroscopy and the Lausanne Centre for Ultrafast Science, ISIC, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
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Sanchez-Gonzalez A, Micaelli P, Olivier C, Barillot TR, Ilchen M, Lutman AA, Marinelli A, Maxwell T, Achner A, Agåker M, Berrah N, Bostedt C, Bozek JD, Buck J, Bucksbaum PH, Montero SC, Cooper B, Cryan JP, Dong M, Feifel R, Frasinski LJ, Fukuzawa H, Galler A, Hartmann G, Hartmann N, Helml W, Johnson AS, Knie A, Lindahl AO, Liu J, Motomura K, Mucke M, O'Grady C, Rubensson JE, Simpson ER, Squibb RJ, Såthe C, Ueda K, Vacher M, Walke DJ, Zhaunerchyk V, Coffee RN, Marangos JP. Accurate prediction of X-ray pulse properties from a free-electron laser using machine learning. Nat Commun 2017; 8:15461. [PMID: 28580940 PMCID: PMC5465316 DOI: 10.1038/ncomms15461] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 03/30/2017] [Indexed: 11/09/2022] Open
Abstract
Free-electron lasers providing ultra-short high-brightness pulses of X-ray radiation have great potential for a wide impact on science, and are a critical element for unravelling the structural dynamics of matter. To fully harness this potential, we must accurately know the X-ray properties: intensity, spectrum and temporal profile. Owing to the inherent fluctuations in free-electron lasers, this mandates a full characterization of the properties for each and every pulse. While diagnostics of these properties exist, they are often invasive and many cannot operate at a high-repetition rate. Here, we present a technique for circumventing this limitation. Employing a machine learning strategy, we can accurately predict X-ray properties for every shot using only parameters that are easily recorded at high-repetition rate, by training a model on a small set of fully diagnosed pulses. This opens the door to fully realizing the promise of next-generation high-repetition rate X-ray lasers.
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Affiliation(s)
| | - P Micaelli
- Department of Physics, Imperial College London, London, SW7 2AZ, UK
| | - C Olivier
- Department of Physics, Imperial College London, London, SW7 2AZ, UK
| | - T R Barillot
- Department of Physics, Imperial College London, London, SW7 2AZ, UK
| | - M Ilchen
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.,European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany
| | - A A Lutman
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - A Marinelli
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - T Maxwell
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - A Achner
- European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany
| | - M Agåker
- Department of Physics and Astronomy, Uppsala University, Uppsala 75120, Sweden
| | - N Berrah
- Department of Physics, University of Connecticut, 2152 Hillside Road, U-3046, Storrs, Connecticut 06269, USA
| | - C Bostedt
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.,Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - J D Bozek
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin, 91192 Gif-sur-Yvette, France
| | - J Buck
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - P H Bucksbaum
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.,Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, California 94305, USA
| | - S Carron Montero
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.,Department of Physics, California Lutheran University, 60 West Olsen Road, Thousand Oaks, California 91360, USA
| | - B Cooper
- Department of Physics, Imperial College London, London, SW7 2AZ, UK
| | - J P Cryan
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - M Dong
- Department of Physics and Astronomy, Uppsala University, Uppsala 75120, Sweden
| | - R Feifel
- Department of Physics, University of Gothenburg, Origovägen 6B, 41296 Gothenburg, Sweden
| | - L J Frasinski
- Department of Physics, Imperial College London, London, SW7 2AZ, UK
| | - H Fukuzawa
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - A Galler
- European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany
| | - G Hartmann
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany.,Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Str 40, 34132 Kassel, Germany
| | - N Hartmann
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - W Helml
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.,Physics Department E11, TU Munich, James-Franck-Str 1, 85748 Garching, Germany
| | - A S Johnson
- Department of Physics, Imperial College London, London, SW7 2AZ, UK
| | - A Knie
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Str 40, 34132 Kassel, Germany
| | - A O Lindahl
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.,Department of Physics, University of Gothenburg, Origovägen 6B, 41296 Gothenburg, Sweden
| | - J Liu
- European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany
| | - K Motomura
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - M Mucke
- Department of Physics and Astronomy, Uppsala University, Uppsala 75120, Sweden
| | - C O'Grady
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - J-E Rubensson
- Department of Physics and Astronomy, Uppsala University, Uppsala 75120, Sweden
| | - E R Simpson
- Department of Physics, Imperial College London, London, SW7 2AZ, UK
| | - R J Squibb
- Department of Physics, University of Gothenburg, Origovägen 6B, 41296 Gothenburg, Sweden
| | - C Såthe
- MAX IV Laboratory, Lund University, Box 118, SE-221 00 Lund, Sweden
| | - K Ueda
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - M Vacher
- Department of Chemistry, Imperial College, London SW7 2AZ, UK.,Department of Chemistry-Ångtröm, Uppsala University, Uppsala 75120, Sweden
| | - D J Walke
- Department of Physics, Imperial College London, London, SW7 2AZ, UK
| | - V Zhaunerchyk
- Department of Physics, University of Gothenburg, Origovägen 6B, 41296 Gothenburg, Sweden
| | - R N Coffee
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - J P Marangos
- Department of Physics, Imperial College London, London, SW7 2AZ, UK
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