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van der Burgt PJM, Gradziel ML. Coincidence mass spectrometry study of double ionization of pyrene by 70 eV electron impact. Phys Chem Chem Phys 2024; 26:10688-10697. [PMID: 38511630 DOI: 10.1039/d4cp00443d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2024]
Abstract
We have performed coincidence mass spectrometry of fragmentation of pyrene molecules by 70 eV electron impact. Ionized fragments have been mass selected using a reflectron time-of-flight mass spectrometer, and a field programmable gate array has been used for the timing of the electron and ion extraction pulses and for the event-by-event detection of the ions. Double ionization results in a number of prominent fragmentations producing two singly-ionized fragments with kinetic energies of up to a few eV. A number of fragmentations produce ions with four or more carbon atoms, which can only be formed by the breaking of at least three C-C bonds.
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Affiliation(s)
- Peter J M van der Burgt
- Department of Experimental Physics, National University of Ireland Maynooth, Maynooth, Co, Kildare, Ireland.
| | - Marcin L Gradziel
- Department of Experimental Physics, National University of Ireland Maynooth, Maynooth, Co, Kildare, Ireland.
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Jin H, Yang J, Xing L, Hao J, Zhang Y, Cao C, Pan Y, Farooq A. An experimental study of indene pyrolysis with synchrotron vacuum ultraviolet photoionization mass spectrometry. Phys Chem Chem Phys 2019; 21:5510-5520. [PMID: 30785151 DOI: 10.1039/c8cp07285j] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Pyrolytic kinetics of indene was studied in a flow reactor at 30 and 760 Torr. Indene and its decomposition products, as well as polycyclic aromatic hydrocarbons (PAHs), were measured with synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS). Five literature models were selected to reproduce the experimental data and analyze the reaction kinetics of indene. The experimental and predicted results illustrate that an indenyl radical is the dominant decomposition intermediate and also the main contributor to the further growth of aromatic rings in the pyrolysis of indene. The indene consumption process needs further precise characterization, especially the subsequent dissociation reactions of indanyl and indenyl radicals. A self-recombination reaction of the indenyl radical and the combination reactions between indenyl and other radicals are found to be necessary for the efficient formation of large PAHs. The absence of these pathways leads to the underprediction of experimental measurements. In contrast, literature models adopting indenyl global reactions for PAH formation generally overestimate the system reactivity. Proper radical combination pathways proposed in a future model should consider not only the PAH formation efficiency but also its impact on system reactivity.
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Affiliation(s)
- Hanfeng Jin
- Clean Combustion Research Centre, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.
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Johansson KO, Zádor J, Elvati P, Campbell MF, Schrader PE, Richards-Henderson NK, Wilson KR, Violi A, Michelsen HA. Critical Assessment of Photoionization Efficiency Measurements for Characterization of Soot-Precursor Species. J Phys Chem A 2017; 121:4475-4485. [DOI: 10.1021/acs.jpca.7b02992] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. Olof Johansson
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94550, United States
| | - Judit Zádor
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94550, United States
| | - Paolo Elvati
- Department
of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Matthew F. Campbell
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94550, United States
| | - Paul E. Schrader
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94550, United States
| | | | - Kevin R. Wilson
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Angela Violi
- Department
of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
- Departments
of Chemical Engineering, Macromolecular Science and Engineering, Biophysics
Program, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Hope A. Michelsen
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94550, United States
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