期刊
CHEMICAL PHYSICS LETTERS
卷 783, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.cplett.2021.139045
关键词
Photoionization; Synchrotron radiation; BrFPh; Density function theory
资金
- National Natural Science Foundation of China [U1932149]
- Natural Science Foundation of Jiangsu Province [BK20191395]
- Natural Science Foundation of the Higher Education Institutions of Jiangsu Province of China [18KJA140002]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX21_0989]
In this study, the photoionization and photodissociation of BrFPh molecules were investigated using VUV synchrotron radiation. The experimental results for the photoionization and dissociation energies of various isomers were in good agreement with theoretical calculations using DFT. This research provides important theoretical support for analyzing the photoionization and dissociative photoionization processes of BrFPh molecules.
Bromofluorobenzene(BrFPh) is one of the major volatile atmospheric pollutants. In this paper, using the VUV synchrotron radiation as the excitation source, the photoionization time of flight mass spectra of ortho-, meta-, para-BrFPh moleclues were recorded and the mass spectra illustrated that BrFPh molecule would be ionized into C6H4BrF+ and then dissociate into C6H4F+ and Br atom under the synchrotron radiation. Then the photoionization efficiency (PIE) curves of each parent ions and fragment ions were obtained by plotting the ion intensity versus photon energy. And the photoionization energies of three isomers of BrFPh molecules were determined to be 9.10 eV, 9.16 eV, 8.98 eV. Meanwhile, the photodissociation energies of o-, m-, p-C6H4BrF+ ions were determined to be 3.71 eV, 3.50 eV and 3.63 eV, respectively. Furthermore, the photoionization and photodissociation energies of them were also calculated based on DFT via B3LYP/6-311++G basis set. The theoretical results are in excellent agreement with the experimental values, and could provide important theoretical support for the experimental analysis of the photoionization and dissociative photoionization process of BrFPh molecules.
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