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Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
Published on: July 12, 2016
Electron-impact ionization of CClF3 and CHClF2: absolute cross sections and fragmentation dynamics
W Wolff1, M Dogan2, J H C Basilio1
1Physics Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brasil.
None:
We report experimental absolute total and partial ionization cross sections for electron collisions with chlorotrifluorocarbon (CFC-13, CClF3) and chlorodifluoromethane (HCFC-22, CHClF2) in the energy range from 20 to 1000 eV. For CClF3 the ionic fragments CF3+ and CClF2+ were identified to have the highest ionization cross sections, indicating a high release of chlorine and fluorine atoms. CHClF2 dissociates primarily into C(H)F2+, C(H)ClF+, and C(H)Cl+ with the release of Cl and/or F atoms. For CHClF2 single and double charged species, adiabatic ionization and partial potential energy surface calculations were performed to obtain insights into the formation-dynamics of neutral chlorine and fluorine and the pathways for the formation of metastable dications. While CHClF22+ is formed in a single-step double-electron emission, unstable CClF32+ dissociates and CClF22+ is observed. Both metastable dications have a triangular planar-like shape and show enhanced dipole moments.
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