Vacuum ultraviolet photodynamics of the ...
Document type :
Article dans une revue scientifique: Article original
DOI :
Permalink :
Title :
Vacuum ultraviolet photodynamics of the methyl peroxy radical studied by double imaging photoelectron photoion coincidences
Author(s) :
Tang, Xiaofeng [Auteur]
Anhui Institute of Optics and Fine Mechanics
Gu, Xuejun [Auteur]
Anhui Institute of Optics and Fine Mechanics
Lin, Xiaoxiao [Auteur]
Anhui Institute of Optics and Fine Mechanics
Zhang, Weijun [Auteur]
Anhui Institute of Optics and Fine Mechanics
Garcia, Gustavo A. [Auteur]
Synchrotron SOLEIL [SSOLEIL]
Fittschen, Christa [Auteur]
Physicochimie des Processus de Combustion et de l’Atmosphère - UMR 8522 [PC2A]
Loison, Jean-Christophe [Auteur]
Institut des Sciences Moléculaires [ISM]
Voronova, Krisztina [Auteur]
University of Nevada [Reno]
Sztáray, Bálint [Auteur]
University of the Pacific [Stockton]
Nahon, Laurent [Auteur]
Synchrotron SOLEIL [SSOLEIL]
Anhui Institute of Optics and Fine Mechanics
Gu, Xuejun [Auteur]
Anhui Institute of Optics and Fine Mechanics
Lin, Xiaoxiao [Auteur]
Anhui Institute of Optics and Fine Mechanics
Zhang, Weijun [Auteur]
Anhui Institute of Optics and Fine Mechanics
Garcia, Gustavo A. [Auteur]
Synchrotron SOLEIL [SSOLEIL]
Fittschen, Christa [Auteur]
Physicochimie des Processus de Combustion et de l’Atmosphère - UMR 8522 [PC2A]
Loison, Jean-Christophe [Auteur]
Institut des Sciences Moléculaires [ISM]
Voronova, Krisztina [Auteur]
University of Nevada [Reno]
Sztáray, Bálint [Auteur]
University of the Pacific [Stockton]
Nahon, Laurent [Auteur]
Synchrotron SOLEIL [SSOLEIL]
Journal title :
The Journal of Chemical Physics
Abbreviated title :
J. Chem. Phys.
Volume number :
152
Publisher :
AIP Publishing
Publication date :
2020-03-14
HAL domain(s) :
Physique [physics]/Mécanique [physics]
Physique [physics]/Physique [physics]/Chimie-Physique [physics.chem-ph]
Chimie/Chimie théorique et/ou physique
Physique [physics]/Physique [physics]/Chimie-Physique [physics.chem-ph]
Chimie/Chimie théorique et/ou physique
English abstract : [en]
The vacuum ultraviolet (VUV) photoionization of the methyl peroxy radical, CH3O2, and unimolecular dissociation of internal energy selected CH3O2+ cations were investigated in the 9.7–12.0 eV energy range by ...
Show more >The vacuum ultraviolet (VUV) photoionization of the methyl peroxy radical, CH3O2, and unimolecular dissociation of internal energy selected CH3O2+ cations were investigated in the 9.7–12.0 eV energy range by synchrotron-based double imaging photoelectron photoion coincidence (i2PEPICO). A microwave discharge flow tube was employed to produce CH3O2 via the reaction of methyl radicals (CH3) with oxygen gas. After identifying and separating the different sources of CH3+ from photoionization of CH3 or dissociative photoionization of CH3O2, the high resolution slow photoelectron spectrum(SPES) of CH3O2 was obtained exhibiting two broad bands superimposed with a complex vibrational structure. The first band of the SPES is attributed to the X3A′′ and a1A′overlapped electronic states of CH3O2+ and the second is assigned to the b1A′ electronic state with the help of theoretical calculations. The adiabatic ionization energy (AIE) of CH3O2 is derived as 10.215 ± 0.015 eV, in good agreement with high-accuracytheoretical data from the literature. The vertical ionization energy of the b1A' electronic state is measured to be 11.5 eV and this state fully dissociates into CH3+ and O2fragments. The 0 K adiabatic appearance energy (AE0K) of the CH3+ fragment ion is determined to be 11.1548 ± 0.020 eV.Show less >
Show more >The vacuum ultraviolet (VUV) photoionization of the methyl peroxy radical, CH3O2, and unimolecular dissociation of internal energy selected CH3O2+ cations were investigated in the 9.7–12.0 eV energy range by synchrotron-based double imaging photoelectron photoion coincidence (i2PEPICO). A microwave discharge flow tube was employed to produce CH3O2 via the reaction of methyl radicals (CH3) with oxygen gas. After identifying and separating the different sources of CH3+ from photoionization of CH3 or dissociative photoionization of CH3O2, the high resolution slow photoelectron spectrum(SPES) of CH3O2 was obtained exhibiting two broad bands superimposed with a complex vibrational structure. The first band of the SPES is attributed to the X3A′′ and a1A′overlapped electronic states of CH3O2+ and the second is assigned to the b1A′ electronic state with the help of theoretical calculations. The adiabatic ionization energy (AIE) of CH3O2 is derived as 10.215 ± 0.015 eV, in good agreement with high-accuracytheoretical data from the literature. The vertical ionization energy of the b1A' electronic state is measured to be 11.5 eV and this state fully dissociates into CH3+ and O2fragments. The 0 K adiabatic appearance energy (AE0K) of the CH3+ fragment ion is determined to be 11.1548 ± 0.020 eV.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Non spécifiée
Administrative institution(s) :
Université de Lille
CNRS
CNRS
Research team(s) :
PhysicoChimie de l'Atmosphère (PCA)
Submission date :
2020-10-07T13:46:45Z
2020-10-08T06:37:26Z
2020-10-08T06:37:26Z
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