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Gerlach M, Schaffner D, Preitschopf T, Karaev E, Bozek J, Holzmeier F, Fischer I. X-ray induced fragmentation of fulminic acid, HCNO. J Chem Phys 2023; 159:114306. [PMID: 37721327 DOI: 10.1063/5.0167395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 08/24/2023] [Indexed: 09/19/2023] Open
Abstract
The fragmentation of fulminic acid, HCNO, after excitation and ionization of core electrons was investigated using Auger-electron-photoion coincidence spectroscopy. A considerable degree of site-selectivity is observed. Ionization of the carbon and oxygen 1s electron leads to around 70% CH+ + NO+, while ionization at the central N-atom produces only 37% CH+ + NO+, but preferentially forms O+ + HCN+ and O+ + CN+. The mass-selected Auger-electron spectra show that these fragments are associated with higher binding energy final states. Furthermore, ionization of the C 1s electron leads to a higher propensity for C-H bond fission compared to O 1s ionization. Following resonant Auger-Meitner decay after 1s → 3π excitation, 12 different ionic products are formed. At the C 1s edge, the parent ion HCNO+ is significantly more stable compared to the other two edges, which we also attribute to the higher contribution of final states with low binding energies in the C 1s resonant Auger electron spectra.
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Affiliation(s)
- Marius Gerlach
- Institute of Physical and Theoretical Chemistry, University of Würzburg, 97074 Würzburg, Germany
| | - Dorothee Schaffner
- Institute of Physical and Theoretical Chemistry, University of Würzburg, 97074 Würzburg, Germany
| | - Tobias Preitschopf
- Institute of Physical and Theoretical Chemistry, University of Würzburg, 97074 Würzburg, Germany
| | - Emil Karaev
- Institute of Physical and Theoretical Chemistry, University of Würzburg, 97074 Würzburg, Germany
| | - John Bozek
- Synchrotron SOLEIL, 91192 Gif-sur-Yvette, France
| | | | - Ingo Fischer
- Institute of Physical and Theoretical Chemistry, University of Würzburg, 97074 Würzburg, Germany
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2
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Coutinho LH, de A Ribeiro F, Tenorio BNC, Coriani S, Dos Santos ACF, Nicolas C, Milosavljevic AR, Bozek JD, Wolff W. NEXAFS and MS-AES spectroscopy of the C 1s and Cl 2p excitation and ionization of chlorobenzene: Production of dicationic species. Phys Chem Chem Phys 2021; 23:27484-27497. [PMID: 34873605 DOI: 10.1039/d1cp03121j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report on single- and double-charge photofragment formation by synchrotron radiation, following C 1s core excitation and ionization and Cl 2p inner excitation and ionization of chlorobenzene, C6H5Cl. From a comparison of experimental near-edge X-ray absorption fine structure spectra and theoretical ab initio calculations, the nature of various core and inner shell transitions of the molecule and pure atomic features were identified. To shed light on the normal Auger processes following excitation or ionization of the molecule at the Cl 2p or C 1s sites, we addressed the induced ionic species formation. With energy resolved electron spectra and ion time-of-flight spectra coincidence measurements, the ionic species were correlated with binding energy regions and initial states of vacancies. We explored the formation of the molecular dication C6H5Cl2+, the analogue benzene dication C6H42+, and the singly charged species produced by single loss of a carbon atom, C5HnCl+. The appearance and intensities of the spectral features associated with these ionic species are shown to be strongly site selective and dependent on the energy ranges of the Auger electron emission. Unexpected intensities for the analogue double charged benzene C6H42+ ion were observed with fast Auger electrons. The transitions leading to C6H5Cl2+ were identified from the binding energy representation of high resolution electron energy spectra. Most C6H5Cl2+ ions decay into two singly charged moieties, but intermediate channels are opened leading to other heavy dicationic species, C6H42+ and C6H4Cl2+, the channel leading to the first of these being much more favored than the other.
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Affiliation(s)
- Lúcia H Coutinho
- Physics Institute, Federal University of Rio de Janeiro, Rio de Janeiro, 21941-972, Brazil.
| | | | - Bruno N C Tenorio
- Department of Chemistry, Technical University of Denmark, Kongens Lyngby, 2800, Denmark
| | - Sonia Coriani
- Department of Chemistry, Technical University of Denmark, Kongens Lyngby, 2800, Denmark
| | - Antonio C F Dos Santos
- Physics Institute, Federal University of Rio de Janeiro, Rio de Janeiro, 21941-972, Brazil.
| | | | | | - John D Bozek
- Synchrotron SOLEIL, Gif-sur-Yvette, 91192, France
| | - Wania Wolff
- Physics Institute, Federal University of Rio de Janeiro, Rio de Janeiro, 21941-972, Brazil.
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Gerlach M, Fantuzzi F, Wohlfart L, Kopp K, Engels B, Bozek J, Nicolas C, Mayer D, Gühr M, Holzmeier F, Fischer I. Fragmentation of isocyanic acid, HNCO, following core excitation and ionization. J Chem Phys 2021; 154:114302. [PMID: 33752348 DOI: 10.1063/5.0044506] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
We report a study on the fragmentation of core-ionized and core-excited isocyanic acid, HNCO, using Auger-electron/photoion coincidence spectroscopy. Site-selectivity is observed both for normal and resonant Auger electron decay. Oxygen 1s ionization leads to the CO+ + NH+ ion pairs, while nitrogen 1s ionization results in three-body dissociation and an efficient fragmentation of the H-N bond in the dication. Upon 1s → 10a' resonant excitation, clear differences between O and N sites are discernible as well. In both cases, the correlation between the dissociation channel and the binding energy of the normal Auger electrons indicates that the fragmentation pattern is governed by the excess energy available in the final ionic state. High-level multireference calculations suggest pathways to the formation of the fragment ions NO+ and HCO+, which are observed although the parent compound contains neither N-O nor H-C bonds. This work contributes to the goal to achieve and understand site-selective fragmentation upon ionization and excitation of molecules with soft x-ray radiation.
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Affiliation(s)
- Marius Gerlach
- Institute of Physical and Theoretical Chemistry, University of Würzburg, 97074 Würzburg, Germany
| | - Felipe Fantuzzi
- Institute of Physical and Theoretical Chemistry, University of Würzburg, 97074 Würzburg, Germany
| | - Lilith Wohlfart
- Institute of Physical and Theoretical Chemistry, University of Würzburg, 97074 Würzburg, Germany
| | - Karina Kopp
- Institute of Physical and Theoretical Chemistry, University of Würzburg, 97074 Würzburg, Germany
| | - Bernd Engels
- Institute of Physical and Theoretical Chemistry, University of Würzburg, 97074 Würzburg, Germany
| | - John Bozek
- Synchrotron SOLEIL, 91192 Gif-sur-Yvette, France
| | | | - Dennis Mayer
- Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam-Golm, Germany
| | - Markus Gühr
- Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam-Golm, Germany
| | - Fabian Holzmeier
- Dipartimento di Fisica, Politecnico di Milano, 20133 Milano, Italy
| | - Ingo Fischer
- Institute of Physical and Theoretical Chemistry, University of Würzburg, 97074 Würzburg, Germany
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4
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Futamata N, Yamamura R, Trinh Ha D, Takahashi O. Fragmentation pathways of methylbenzoate cations following core excitation: Theoretical approach using graph theory. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2020.138316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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5
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Wang YT, Chiang YJ, Liu CL. Resolved specific dissociation channel of a core-excited peptide model molecule. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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6
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Zagorodskikh S, Eland JHD, Zhaunerchyk V, Mucke M, Squibb RJ, Linusson P, Feifel R. Mechanisms of site-specific photochemistry following core-shell ionization of chemically inequivalent carbon atoms in acetaldehyde (ethanal). J Chem Phys 2016; 145:124302. [DOI: 10.1063/1.4962823] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Affiliation(s)
- Sergey Zagorodskikh
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
- Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden
| | - John 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, United Kingdom
| | - Vitali Zhaunerchyk
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
- Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden
| | - Melanie Mucke
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
| | - Richard J. Squibb
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
- Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden
| | - Per Linusson
- Department of Physics, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden
| | - Raimund Feifel
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
- Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden
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Boll R, Erk B, Coffee R, Trippel S, Kierspel T, Bomme C, Bozek JD, Burkett M, Carron S, Ferguson KR, Foucar L, Küpper J, Marchenko T, Miron C, Patanen M, Osipov T, Schorb S, Simon M, Swiggers M, Techert S, Ueda K, Bostedt C, Rolles D, Rudenko A. Charge transfer in dissociating iodomethane and fluoromethane molecules ionized by intense femtosecond X-ray pulses. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2016; 3:043207. [PMID: 27051675 PMCID: PMC4808069 DOI: 10.1063/1.4944344] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Accepted: 03/04/2016] [Indexed: 05/07/2023]
Abstract
Ultrafast electron transfer in dissociating iodomethane and fluoromethane molecules was studied at the Linac Coherent Light Source free-electron laser using an ultraviolet-pump, X-ray-probe scheme. The results for both molecules are discussed with respect to the nature of their UV excitation and different chemical properties. Signatures of long-distance intramolecular charge transfer are observed for both species, and a quantitative analysis of its distance dependence in iodomethane is carried out for charge states up to I(21+). The reconstructed critical distances for electron transfer are in good agreement with a classical over-the-barrier model and with an earlier experiment employing a near-infrared pump pulse.
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Affiliation(s)
| | - Benjamin Erk
- Deutsches Elektronen-Synchrotron (DESY) , 22607 Hamburg, Germany
| | - Ryan Coffee
- SLAC National Accelerator Laboratory , Menlo Park, California 94025, USA
| | - Sebastian Trippel
- Center for Free-Electron Laser Science, DESY , 22607 Hamburg, Germany
| | | | - Cédric Bomme
- Deutsches Elektronen-Synchrotron (DESY) , 22607 Hamburg, Germany
| | - John D Bozek
- SLAC National Accelerator Laboratory , Menlo Park, California 94025, USA
| | - Mitchell Burkett
- J.R. Macdonald Laboratory, Kansas State University , Manhattan, Kansas 66506, USA
| | - Sebastian Carron
- SLAC National Accelerator Laboratory , Menlo Park, California 94025, USA
| | - Ken R Ferguson
- SLAC National Accelerator Laboratory , Menlo Park, California 94025, USA
| | - Lutz Foucar
- Max Planck Institute for Medical Research , 69120 Heidelberg, Germany
| | | | - Tatiana Marchenko
- Sorbonne Universités , UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matiere et Rayonnement, F-75005 Paris, France
| | | | | | - Timur Osipov
- SLAC National Accelerator Laboratory , Menlo Park, California 94025, USA
| | - Sebastian Schorb
- SLAC National Accelerator Laboratory , Menlo Park, California 94025, USA
| | - Marc Simon
- Sorbonne Universités , UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matiere et Rayonnement, F-75005 Paris, France
| | - Michelle Swiggers
- SLAC National Accelerator Laboratory , Menlo Park, California 94025, USA
| | | | - Kiyoshi Ueda
- IMRAM, Tohoku University , 980-8577 Sendai, Japan
| | | | | | - Artem Rudenko
- J.R. Macdonald Laboratory, Kansas State University , Manhattan, Kansas 66506, USA
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8
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Salén P, Yatsyna V, Schio L, Feifel R, Richter R, Alagia M, Stranges S, Zhaunerchyk V. NEXAFS spectroscopy and site-specific fragmentation of N-methylformamide, N,N-dimethylformamide, and N,N-dimethylacetamide. J Chem Phys 2016; 144:244310. [DOI: 10.1063/1.4954704] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Peter Salén
- Department of Physics, Stockholm University, 106 91 Stockholm, Sweden
| | - Vasyl Yatsyna
- Department of Physics, University of Gothenburg, 412 96 Gothenburg, Sweden
| | - Luca Schio
- IOM-CNR Tasc, SS-14, Km 163.5 Area Science Park, Basovizza, I-34149 Trieste, Italy
| | - Raimund Feifel
- Department of Physics, University of Gothenburg, 412 96 Gothenburg, Sweden
| | - Robert Richter
- Elettra - Sincrotrone Trieste, Area Science Park, 34149 Basovizza, Trieste, Italy
| | - Michele Alagia
- IOM-CNR Tasc, SS-14, Km 163.5 Area Science Park, Basovizza, I-34149 Trieste, Italy
| | - Stefano Stranges
- IOM-CNR Tasc, SS-14, Km 163.5 Area Science Park, Basovizza, I-34149 Trieste, Italy
- Dipartimento di Chimica e Tecnologie del Farmaco, Universitá Sapienza, Roma I-00185, Italy
| | - Vitali Zhaunerchyk
- Department of Physics, University of Gothenburg, 412 96 Gothenburg, Sweden
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9
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Li C, Salén P, Yatsyna V, Schio L, Feifel R, Squibb R, Kamińska M, Larsson M, Richter R, Alagia M, Stranges S, Monti S, Carravetta V, Zhaunerchyk V. Experimental and theoretical XPS and NEXAFS studies of N-methylacetamide and N-methyltrifluoroacetamide. Phys Chem Chem Phys 2016; 18:2210-8. [DOI: 10.1039/c5cp06441d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Experimental and theoretical spectra of N-methylacetamide and N-methyltrifluoroacetamide at the K-edges are reported.
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10
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Bolognesi P, Kettunen JA, Cartoni A, Richter R, Tosic S, Maclot S, Rousseau P, Delaunay R, Avaldi L. Site- and state-selected photofragmentation of 2Br-pyrimidine. Phys Chem Chem Phys 2015; 17:24063-9. [PMID: 26314495 DOI: 10.1039/c5cp02601f] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The fragmentation of the 2Br-pyrimidine molecule following direct valence photoionization or inner shell excitation has been studied by electron-ion coincidence experiments. 2Br-pyrimidine has been chosen as a model for the class of pyrimidinic building blocks of three nucleic acids and several radiosensitizers. It is known that the site- and state-localization of energy deposition, typical of inner shell excitation, results in the enhancement of the total ion yield as well as in changes in the relative intensity of the different fragmentation channels. Here we address the question of the origin of this selective fragmentation by using electron-ion coincidence techniques. The results show that the fragmentation is strongly selective in the final singly charged ion state, independently of the process that leads to the population of that state, and the dominant fragmentation patterns correlate with the nearest appearance potential.
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Affiliation(s)
- P Bolognesi
- CNR-Istituto di Struttura della Materia, Area della Ricerca di Roma1, Monterotondo Scalo, Italy.
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11
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12
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Stener M, Decleva P, Mizuno T, Yoshida H, Yagishita A. Off-resonance photoemission dynamics studied by recoil frame F1s and C1s photoelectron angular distributions of CH3F. J Chem Phys 2014; 140:044305. [DOI: 10.1063/1.4862267] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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13
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Salén P, Kamińska M, Squibb RJ, Richter R, Alagia M, Stranges S, van der Meulen P, Eland JHD, Feifel R, Zhaunerchyk V. Selectivity in fragmentation of N-methylacetamide after resonant K-shell excitation. Phys Chem Chem Phys 2014; 16:15231-40. [DOI: 10.1039/c4cp01067a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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14
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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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15
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Sugishima A, Nagaya K, Iwayama H, Yao M, Adachi J, Kimura Y, Yamazaki M, Yagishita A. Dissociation dynamics of C6H6 and C6H5F molecules following carbon 1s and fluorine 1s photoionization studied by three-dimensional momentum imaging method. J Chem Phys 2009; 131:114309. [DOI: 10.1063/1.3224117] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Rolles D, Prümper G, Fukuzawa H, Liu XJ, Pesić ZD, Fink RF, Grum-Grzhimailo AN, Dumitriu I, Berrah N, Ueda K. Molecular-frame angular distributions of resonant CO:C(1s) Auger electrons. PHYSICAL REVIEW LETTERS 2008; 101:263002. [PMID: 19437639 DOI: 10.1103/physrevlett.101.263002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The molecular-frame angular distributions of resonantly excited CO:C(1s) --> pi* Auger electrons were determined using angle-resolved electron-ion coincidence spectroscopy in combination with a novel transformation procedure. Our new methodology yields full three-dimensional electron angular distributions with high energy resolution from the measurement of electrons at only two angles. The experimentally determined distributions are well reproduced by calculations performed in a simple one-center approximation, allowing an unambiguous identification of several overlapping Auger lines.
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Affiliation(s)
- D Rolles
- Physics Department, Western Michigan University, Kalamazoo, Michigan 49008, USA
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17
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Prümper G, Fukuzawa H, Lischke T, Ueda K. Combining high mass resolution and velocity imaging in a time-of-flight ion spectrometer using pulsed fields and an electrostatic lens. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2007; 78:083104. [PMID: 17764310 DOI: 10.1063/1.2774823] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
We describe a momentum resolving time-of-flight ion mass spectrometer that combines a high mass resolution, a velocity focusing condition for improved momentum resolution, and field-free conditions in the source region for high resolution electron detection. It is used in electron-ion coincidence experiments to record multiple ionic fragments produced in breakup reactions of small to medium sized molecules, such as F(3)SiCH(2)CH(2)Si(CH(3))(3). These breakup reactions are caused by soft x rays or intense laser fields. The ion spectrometer uses pulsed extraction fields, an electrostatic lens, and a delay line detector to resolve the position. Additionally, we describe a simple analytical method for calculating the momentum from the measured hit position and the time of flight of the ions.
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Affiliation(s)
- G Prümper
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan.
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