1
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Bodi A, Hafliðason A, Kvaran Á. Branching ratios in the dissociative photoionization of iodomethane by photoelectron photoion coincidence. Phys Chem Chem Phys 2023; 25:7383-7393. [PMID: 36826403 DOI: 10.1039/d2cp03339a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Iodomethane yields ten fragment ions after valence photoionization, in part by multiple dissociation pathways for each, thanks to a plethora of electronic states available in the parent ion as well as in the fragments. The comprehensive breakdown diagram from 11 eV to the double ionization onset, i.e., 26.7 eV, is recorded at high resolution using double imaging photoelectron photoion coincidence spectroscopy with synchrotron vacuum ultraviolet radiation. Based on fragment ion groupings, the changing branching ratios between these groups and between fragment ions within each group, as well as ancillary thermochemistry, we provide an overview of the dissociation pathways at play. Statistical and impulsive dissociations are identified using kinetic energy release analysis. Finally, a newly observed regime change is discussed in double ionization, whereby coincident H+ + I+ formation dominates over a 4 eV photon energy range, outcompeting the normally prevailing CH3+ + I+ channel.
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Affiliation(s)
- Andras Bodi
- Laboratory for Synchrotron Radiation and Femtochemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland.
| | - Arnar Hafliðason
- Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavík, Iceland
| | - Ágúst Kvaran
- Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavík, Iceland
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2
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Ismail I, Khalal MA, Huttula M, Jänkälä K, Bizau JM, Cubaynes D, Hikosaka Y, Bučar K, Žitnik M, Andric L, Lablanquie P, Palaudoux J, Penent F. A modified magnetic bottle electron spectrometer for the detection of multiply charged ions in coincidence with all correlated electrons: decay pathways to Xe 3+ above xenon-4d ionization threshold. Phys Chem Chem Phys 2022; 24:20219-20227. [PMID: 35983783 DOI: 10.1039/d2cp02930h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Single-photon multiple photoionization results from electron correlations that make this process possible beyond the independent electron approximation. To study this phenomenon experimentally, the detection in coincidence of all emitted electrons is the most direct approach. It provides the relative contribution of all possible multiple ionization processes, the energy distribution between electrons that can reveal simultaneous or sequential mechanisms, and, if possible, the angular correlations between electrons. In the present work, we present a new magnet design of our magnetic bottle electron spectrometer that allows the detection of multiply charged Xen+ ions in coincidence with n electrons. This new coincidence detection allows more efficient extraction of minor channels that are otherwise masked by random coincidences. The proof of principle is provided for xenon triple ionization.
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Affiliation(s)
- I Ismail
- Sorbonne Université, CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement, LCPMR, F-75005 Paris Cedex 05, France.
| | - M A Khalal
- Sorbonne Université, CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement, LCPMR, F-75005 Paris Cedex 05, France.
| | - M Huttula
- Nano and Molecular Systems Research Unit, University of Oulu, PO Box 3000, FI-90014, Finland
| | - K Jänkälä
- Nano and Molecular Systems Research Unit, University of Oulu, PO Box 3000, FI-90014, Finland
| | - J-M Bizau
- ISMO, CNRS UMR 8214, Université, Paris-Sud, bâtiment 350, F-91405, Orsay, France.,Synchrotron SOLEIL, l'Orme des Merisiers, Saint-Aubin, BP 48, F-91192, Gif-sur-Yvette Cedex, France
| | - D Cubaynes
- ISMO, CNRS UMR 8214, Université, Paris-Sud, bâtiment 350, F-91405, Orsay, France.,Synchrotron SOLEIL, l'Orme des Merisiers, Saint-Aubin, BP 48, F-91192, Gif-sur-Yvette Cedex, France
| | - Y Hikosaka
- Institute of Liberal Arts and Sciences, University of Toyama, 930-0194, Japan
| | - K Bučar
- Jozef Stefan Institute, Jamova Cesta 39, SI-1001 Ljubljana, Slovenia
| | - M Žitnik
- Jozef Stefan Institute, Jamova Cesta 39, SI-1001 Ljubljana, Slovenia
| | - L Andric
- Sorbonne Université, CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement, LCPMR, F-75005 Paris Cedex 05, France.
| | - P Lablanquie
- Sorbonne Université, CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement, LCPMR, F-75005 Paris Cedex 05, France.
| | - J Palaudoux
- Sorbonne Université, CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement, LCPMR, F-75005 Paris Cedex 05, France.
| | - F Penent
- Sorbonne Université, CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement, LCPMR, F-75005 Paris Cedex 05, France.
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3
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Raspe K, Müller M, Iwe N, Wolf RN, Oelßner P, Martinez F, Schweikhard L, Meiwes-Broer KH, Tiggesbäumker J. A versatile setup for studying size and charge-state selected polyanionic nanoparticles. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:043301. [PMID: 35489944 DOI: 10.1063/5.0085187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 03/09/2022] [Indexed: 06/14/2023]
Abstract
Using the example of metal clusters, an experimental setup and procedure is presented, which allows for the generation of size and charge-state selected polyanions from monoanions in a molecular beam. As a characteristic feature of this modular setup, the further charging process via sequential electron attachment within a three-state digital trap takes place after mass-selection. In contrast to other approaches, the rf-based concept permits access to heavy particles. The procedure is highly flexible with respect to the preparation process and potentially suitable for a wide variety of anionic species. By adjusting the storage conditions, i.e., the radio frequency, to the change in the mass-to-charge ratio, we succeeded in producing clusters in highly negative charge states, i.e., Ag800 7-. The capabilities of the setup are demonstrated by experiments extracting electronic and optical properties of polyanionic metal clusters by analyzing the corresponding photoelectron spectra.
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Affiliation(s)
- K Raspe
- Institute of Physics, University of Rostock, 18059 Rostock, Germany
| | - M Müller
- Institute of Physics, University of Rostock, 18059 Rostock, Germany
| | - N Iwe
- Institute of Physics, University of Rostock, 18059 Rostock, Germany
| | - R N Wolf
- Institute of Physics, University of Greifswald, 17489 Greifswald, Germany
| | - P Oelßner
- Institute of Physics, University of Rostock, 18059 Rostock, Germany
| | - F Martinez
- Institute of Physics, University of Rostock, 18059 Rostock, Germany
| | - L Schweikhard
- Institute of Physics, University of Greifswald, 17489 Greifswald, Germany
| | - K-H Meiwes-Broer
- Institute of Physics, University of Rostock, 18059 Rostock, Germany
| | - J Tiggesbäumker
- Institute of Physics, University of Rostock, 18059 Rostock, Germany
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4
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Barba Ž, Bučar K, Krušič Š, Žitnik M. Magnetic bottle electron spectrometer driven by electron pulses. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:073108. [PMID: 32752866 DOI: 10.1063/5.0012523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 06/29/2020] [Indexed: 06/11/2023]
Abstract
We report an electron scattering experiment on argon gas where a keV electron beam is used as a probe and electrons are collected with a magnetic bottle spectrometer. For this purpose, we have built a thermionic gun that produces electron pulses with nanosecond duration by sweeping the beam across a small aperture. To reach the target, electrons must pass through the hole in an axially symmetric arrangement of strong permanent magnets required to operate the magnetic bottle. From the recorded multi-hit sequence of electron arrival times on the microchannel plate detector, a kinetic energy spectrum is built that allows an analysis of the elastic and inelastic electron scattering channels by means of the coincidence technique. After a description of the instrumental configuration and discussion of suitable working parameters, the results of an angle-integrated (e, 2e) experiment are presented for 800 eV electron scattering on argon atoms.
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Affiliation(s)
- Žiga Barba
- Jožef Stefan Institute, Jamova 39, SI-1001 Ljubljana, Slovenia
| | - Klemen Bučar
- Jožef Stefan Institute, Jamova 39, SI-1001 Ljubljana, Slovenia
| | - Špela Krušič
- Jožef Stefan Institute, Jamova 39, SI-1001 Ljubljana, Slovenia
| | - Matjaž Žitnik
- Jožef Stefan Institute, Jamova 39, SI-1001 Ljubljana, SloveniaFaculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia
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5
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Fushitani M, Sasaki Y, Matsuda A, Fujise H, Kawabe Y, Hashigaya K, Owada S, Togashi T, Nakajima K, Yabashi M, Hikosaka Y, Hishikawa A. Multielectron-Ion Coincidence Spectroscopy of Xe in Extreme Ultraviolet Laser Fields: Nonlinear Multiple Ionization via Double Core-Hole States. PHYSICAL REVIEW LETTERS 2020; 124:193201. [PMID: 32469563 DOI: 10.1103/physrevlett.124.193201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 04/14/2020] [Indexed: 06/11/2023]
Abstract
Ultrafast multiphoton ionization of Xe in strong extreme ultraviolet free-electron laser (FEL) fields (91 eV, 30 fs, 1.6×10^{12} W/cm^{2}) has been investigated by multielectron-ion coincidence spectroscopy. The electron spectra recorded in coincidence with Xe^{4+} show characteristic features associated with two-photon absorption to the 4d^{-2} double core-hole (DCH) states and subsequent Auger decay. It is found that the pathway via the DCH states, which has eluded clear identification in previous studies, makes a large contribution to the multiple ionization, despite the long FEL pulse duration compared with the lifetime of the 4d core-hole states.
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Affiliation(s)
- M Fushitani
- Department of Chemistry, Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
- RIKEN, SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - Y Sasaki
- Department of Chemistry, Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
| | - A Matsuda
- Department of Chemistry, Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
- RIKEN, SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - H Fujise
- Department of Chemistry, Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
- RIKEN, SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - Y Kawabe
- Department of Chemistry, Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
| | - K Hashigaya
- Department of Chemistry, Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
| | - S Owada
- RIKEN, SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - T Togashi
- RIKEN, SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - K Nakajima
- RIKEN, SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - M Yabashi
- RIKEN, SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - Y Hikosaka
- RIKEN, SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Institute of Liberal Arts and Sciences, University of Toyama, Toyama 930-0194, Japan
| | - A Hishikawa
- Department of Chemistry, Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
- RIKEN, SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Research Center for Materials Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
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6
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Squibb RJ, Sapunar M, Ponzi A, Richter R, Kivimäki A, Plekan O, Finetti P, Sisourat N, Zhaunerchyk V, Marchenko T, Journel L, Guillemin R, Cucini R, Coreno M, Grazioli C, Di Fraia M, Callegari C, Prince KC, Decleva P, Simon M, Eland JHD, Došlić N, Feifel R, Piancastelli MN. Acetylacetone photodynamics at a seeded free-electron laser. Nat Commun 2018; 9:63. [PMID: 29302026 PMCID: PMC5754354 DOI: 10.1038/s41467-017-02478-0] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 12/04/2017] [Indexed: 11/30/2022] Open
Abstract
The first steps in photochemical processes, such as photosynthesis or animal vision, involve changes in electronic and geometric structure on extremely short time scales. Time-resolved photoelectron spectroscopy is a natural way to measure such changes, but has been hindered hitherto by limitations of available pulsed light sources in the vacuum-ultraviolet and soft X-ray spectral region, which have insufficient resolution in time and energy simultaneously. The unique combination of intensity, energy resolution, and femtosecond pulse duration of the FERMI-seeded free-electron laser can now provide exceptionally detailed information on photoexcitation–deexcitation and fragmentation in pump-probe experiments on the 50-femtosecond time scale. For the prototypical system acetylacetone we report here electron spectra measured as a function of time delay with enough spectral and time resolution to follow several photoexcited species through well-characterized individual steps, interpreted using state-of-the-art static and dynamics calculations. These results open the way for investigations of photochemical processes in unprecedented detail. The first steps in photochemical processes involve changes in electronic and geometric structure on extremely short timescales. Here, the authors report femtosecond dynamics in prototypical acetylacetone, by pump-probe photoexcitation-photoemission experiments and static and dynamics calculations.
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Affiliation(s)
- R J Squibb
- Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96, Gothenburg, Sweden
| | - M Sapunar
- Institut Ruđer Bošković, Bijenička cesta 54, 10000, Zagreb, Croatia
| | - A Ponzi
- Institut Ruđer Bošković, Bijenička cesta 54, 10000, Zagreb, Croatia
| | - R Richter
- Elettra-Sincrotrone Trieste, Strada Statale 14-km 163.5, 34149, Basovizza, Trieste, Italy
| | - A Kivimäki
- Consiglio Nazionale delle Ricerche-Istituto Officina dei Materiali, 34149, Trieste, Italy
| | - O Plekan
- Elettra-Sincrotrone Trieste, Strada Statale 14-km 163.5, 34149, Basovizza, Trieste, Italy
| | - P Finetti
- Elettra-Sincrotrone Trieste, Strada Statale 14-km 163.5, 34149, Basovizza, Trieste, Italy
| | - N Sisourat
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 75005, Paris Cedex 05, France
| | - V Zhaunerchyk
- Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96, Gothenburg, Sweden
| | - T Marchenko
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 75005, Paris Cedex 05, France
| | - L Journel
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 75005, Paris Cedex 05, France
| | - R Guillemin
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 75005, Paris Cedex 05, France
| | - R Cucini
- Elettra-Sincrotrone Trieste, Strada Statale 14-km 163.5, 34149, Basovizza, Trieste, Italy
| | - M Coreno
- Elettra-Sincrotrone Trieste, Strada Statale 14-km 163.5, 34149, Basovizza, Trieste, Italy.,Consiglio Nazionale delle Ricerche - Istituto di Struttura della Materia, LD2 unit, 34149, Trieste, Italy
| | - C Grazioli
- Elettra-Sincrotrone Trieste, Strada Statale 14-km 163.5, 34149, Basovizza, Trieste, Italy.,Consiglio Nazionale delle Ricerche - Istituto di Struttura della Materia, LD2 unit, 34149, Trieste, Italy
| | - M Di Fraia
- Elettra-Sincrotrone Trieste, Strada Statale 14-km 163.5, 34149, Basovizza, Trieste, Italy.,Consiglio Nazionale delle Ricerche - Istituto di Struttura della Materia, LD2 unit, 34149, Trieste, Italy
| | - C Callegari
- Elettra-Sincrotrone Trieste, Strada Statale 14-km 163.5, 34149, Basovizza, Trieste, Italy.,Consiglio Nazionale delle Ricerche - Istituto di Struttura della Materia, LD2 unit, 34149, Trieste, Italy
| | - K C Prince
- Elettra-Sincrotrone Trieste, Strada Statale 14-km 163.5, 34149, Basovizza, Trieste, Italy.,Molecular Model Discovery Laboratory, Department of Chemistry and Biotechnology, Swinburne University of Technology, Melbourne, VIC, 3122, Australia
| | - P Decleva
- Consiglio Nazionale delle Ricerche-Istituto Officina dei Materiali, 34149, Trieste, Italy.,Dipartimento di Scienze Chimiche e Farmaceutiche, Universitá di Trieste, 34127, Trieste, Italy
| | - M Simon
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 75005, Paris Cedex 05, France
| | - J H D Eland
- Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96, Gothenburg, Sweden.,Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK
| | - N Došlić
- Institut Ruđer Bošković, Bijenička cesta 54, 10000, Zagreb, Croatia
| | - R Feifel
- Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96, Gothenburg, Sweden
| | - M N Piancastelli
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 75005, Paris Cedex 05, France. .,Department of Physics and Astronomy, Uppsala University, SE-751 20, Uppsala, Sweden.
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7
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Couch DE, Buckingham GT, Baraban JH, Porterfield JP, Wooldridge LA, Ellison GB, Kapteyn HC, Murnane MM, Peters WK. Tabletop Femtosecond VUV Photoionization and PEPICO Detection of Microreactor Pyrolysis Products. J Phys Chem A 2017; 121:5280-5289. [DOI: 10.1021/acs.jpca.7b02821] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- David E. Couch
- JILA and Department of Physics, University of Colorado, Boulder, Colorado 80309, United States
| | - Grant T. Buckingham
- Department
of Chemistry, University of Colorado, Boulder, Colorado 80309, United States
| | - Joshua H. Baraban
- Department
of Chemistry, University of Colorado, Boulder, Colorado 80309, United States
| | | | - Laura A. Wooldridge
- JILA and Department of Physics, University of Colorado, Boulder, Colorado 80309, United States
| | - G. Barney Ellison
- Department
of Chemistry, University of Colorado, Boulder, Colorado 80309, United States
| | - Henry C. Kapteyn
- JILA and Department of Physics, University of Colorado, Boulder, Colorado 80309, United States
| | - Margaret M. Murnane
- JILA and Department of Physics, University of Colorado, Boulder, Colorado 80309, United States
| | - William K. Peters
- JILA and Department of Physics, University of Colorado, Boulder, Colorado 80309, United States
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8
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Maierhofer P, Bainschab M, Thaler B, Heim P, Ernst WE, Koch M. Disentangling Multichannel Photodissociation Dynamics in Acetone by Time-Resolved Photoelectron-Photoion Coincidence Spectroscopy. J Phys Chem A 2016; 120:6418-23. [PMID: 27459051 DOI: 10.1021/acs.jpca.6b07238] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
For the investigation of photoinduced dynamics in molecules with time-resolved pump-probe photoionization spectroscopy, it is essential to obtain unequivocal information about the fragmentation behavior induced by the laser pulses. We present time-resolved photoelectron-photoion coincidence (PEPICO) experiments to investigate the excited-state dynamics of isolated acetone molecules triggered by two-photon (269 nm) excitation. In the complex situation of different relaxation pathways, we unambiguously identify three distinct pump-probe ionization channels. The high selectivity of PEPICO detection allows us to observe the fragmentation behavior and to follow the time evolution of each channel separately. For channels leading to fragment ions, we quantitatively obtain the fragment-to-parent branching ratio and are able to determine experimentally whether dissociation occurs in the neutral molecule or in the parent ion. These results highlight the importance of coincidence detection for the interpretation of time-resolved photochemical relaxation and dissociation studies if multiple pathways are present.
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Affiliation(s)
- Paul Maierhofer
- Institute of Experimental Physics, Graz University of Technology, NAWI Graz , Petersgasse 16, 8010 Graz, Austria
| | - Markus Bainschab
- Institute of Experimental Physics, Graz University of Technology, NAWI Graz , Petersgasse 16, 8010 Graz, Austria
| | - Bernhard Thaler
- Institute of Experimental Physics, Graz University of Technology, NAWI Graz , Petersgasse 16, 8010 Graz, Austria
| | - Pascal Heim
- Institute of Experimental Physics, Graz University of Technology, NAWI Graz , Petersgasse 16, 8010 Graz, Austria
| | - Wolfgang E Ernst
- Institute of Experimental Physics, Graz University of Technology, NAWI Graz , Petersgasse 16, 8010 Graz, Austria
| | - Markus Koch
- Institute of Experimental Physics, Graz University of Technology, NAWI Graz , Petersgasse 16, 8010 Graz, Austria
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9
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Homonuclear site-specific photochemistry by an ion–electron multi-coincidence spectroscopy technique. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.08.018] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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