期刊
JOURNAL OF CHEMICAL PHYSICS
卷 152, 期 10, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/5.0002109
关键词
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资金
- National Natural Science Foundation of China [21773249, 91961123, 91544228]
- International Partnership Program of Chinese Academy of Sciences [116134KYSB20170048]
- French Agence Nationale de la Recherche (ANR) [ANR-12-BS08-0020-02]
- Chinese Academy of Sciences President's International Fellowship Initiative [2018VMA0055]
- Xu Guangqi program [43270ZD]
- National Science Foundation [CHE-1665464]
The vacuum ultraviolet 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. 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 X(3)A '' and a(1)A ' overlapped electronic states of CH3O2+ and the second is assigned to the b(1)A ' electronic state with the help of theoretical calculations. The adiabatic ionization energy of CH3O2 is derived as 10.215 +/- 0.015 eV, in good agreement with high-accuracy theoretical data from the literature. The vertical ionization energy of the b(1)A ' electronic state is measured to be 11.5 eV and this state fully dissociates into CH3+ and O-2 fragments. The 0 K adiabatic appearance energy (AE(0K)) of the CH3+ fragment ion is determined to be 11.15 +/- 0.02 eV.
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