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Citation: YANG Bin, HUANG Chao-Qun, YANG Rui, WEI Li-Xia, WANG Jing, WANG Si-Sheng, SHAN Xiao-Bin, QI Fei, ZHANG Yun-Wu, SHENG Liu-Si, WANG Zhen-Ya, HAO Li-Qing, ZHOU Shi-Kang. Vacuum Ultraviolet Photoionization and Photodissociation of Pentafluoroethane[J]. Acta Physico-Chimica Sinica, ;2005, 21(05): 539-543. doi: 10.3866/PKU.WHXB20050516 shu

Vacuum Ultraviolet Photoionization and Photodissociation of Pentafluoroethane

1.
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029; Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031

Received Date: 19 November 2004
Available Online: 15 May 2005

The vacuum ultraviolet photoionization and photodissociation of pentafluoroethane have been studied by using synchrotron radiation. The ionization potential of pentafluoroethane is determined to be (12.25±0.10) eV. Photoionization efficiency (PIE) curves for CF₂CF₃⁺、CHFCF₃⁺、CF₂CF₂⁺、CF₃⁺、CHF₂⁺、CHF⁺ and CF⁺ have been measured. The appearance potentials (AP) of these ions are obtained from their PIE curves, and they are (13.93±0.10) eV, (15.25±0.10) eV, (15.12±0.10) eV, (13.30±0.05) eV, (13.05±0.08) eV, (19.17±0.10) eV and (19.56±0.15) eV, respectively. In addition, the energetics of the dissociative photoionizations have been examined by ab initio Gaussian-3 calculations. The computational results are useful in establishing the dissociation channels near the ionization thresholds. According to the experimental results and the energies calculated by Gaussian-3 theory, the main possible pathways of the photodissociation have been analyzed. And the dissociation energies of the molecule and its cation have been derived from experiment and calculation.
- Pentafluoroethane; Photoionization; Appearance potential; Dissociation energy
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