Absolute partial cross sections for the parent ionization of the CF<i>x</i> (<i>x</i>=1–3) free radicals by electron impact

• V. Tarnovsky

  Physics Department, City College of the City University of New York, New York, New York 10031

• K. Becker

  Physics Department, City College of the City University of New York, New York, New York 10031

抄録

We report absolute partial electron-impact ionization cross sections from threshold to 200 eV for the formation of the parent CFx+ ions from the CFx free radicals (x=1–3). Fast (3–3.5 kV) beams of CF3, CF2, and CF radicals were prepared by near-resonant charge transfer of CF3+, CF2+, and CF+ with triethylamine (TEA), Xe, and NF3. The CF and CF3 neutral beams were found to contain primarily ground state neutral radicals with some evidence for the presence of a small amount of vibrational excitation (0.5 eV or less). Contributions to the CF2+ ion signal obtained at electron energies several electron volts below the 11.4 eV threshold for the ionization of ground state CF2 radicals indicate the presence of CF2 metastables (presumably in the 3B1 state) in the CF2 neutral beam. The level of CF2 metastable contamination was found to depend critically on the exact experimental conditions. At 70 eV, the absolute parent ionization cross sections are 0.38±0.07 Å2 (CF3→CF3+), 1.03±0.16 Å2 (CF2→CF2+), and 1.25±0.19 Å2 (CF→CF+), respectively.

収録刊行物

• The Journal of Chemical Physics

  The Journal of Chemical Physics 98 (10), 7868-7874, 1993-05-15

  AIP Publishing

キーワード

• Physical and Theoretical Chemistry
• General Physics and Astronomy

詳細情報

• CRID: 1361699995606019072
• NII論文ID: 30015648187
• DOI: 10.1063/1.464594
• ISSN: 10897690
• ISSN: 00219606
• Web Site: https://pubs.aip.org/aip/jcp/article-pdf/98/10/7868/19023169/7868_1_online.pdf
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