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Absolute electron impact ionization cross-sections for CF4: Three dimensional recoil-ion imaging combined with the relative flow technique.
Wolff, W; Dogan, M; Luna, H; Coutinho, L H; Mootheril, D; Baek, Woonyong; Pfeifer, T; Dorn, A.
Afiliação
  • Wolff W; Physics Institute, Federal University of Rio de Janeiro, Rio de Janeiro CEP 21941-909, Brazil.
  • Dogan M; Max Planck Institute for Nuclear Physics, Heidelberg, Baden-Württemberg D-69117, Germany.
  • Luna H; Physics Institute, Federal University of Rio de Janeiro, Rio de Janeiro CEP 21941-909, Brazil.
  • Coutinho LH; Physics Institute, Federal University of Rio de Janeiro, Rio de Janeiro CEP 21941-909, Brazil.
  • Mootheril D; Max Planck Institute for Nuclear Physics, Heidelberg, Baden-Württemberg D-69117, Germany.
  • Baek W; Physikalisch-Technische Bundesanstalt, Braunschweig, Niedersachsen D-38116, Germany.
  • Pfeifer T; Max Planck Institute for Nuclear Physics, Heidelberg, Baden-Württemberg D-69117, Germany.
  • Dorn A; Max Planck Institute for Nuclear Physics, Heidelberg, Baden-Württemberg D-69117, Germany.
Rev Sci Instrum ; 95(9)2024 Sep 01.
Article em En | MEDLINE | ID: mdl-39230363
ABSTRACT
Here we present measurements of dissociative and non-dissociative cross-sections for the electron impact of the CF4 molecule. The present experiments are based on a Recoil Ion Momentum Spectrometer (RIMS), a standard gas mixing setup for CF4, and a reference gas. The measurements were carried out at several electron energies up to 1 keV, covering the energy range of previous experiments. We apply the relative flow technique (RFT) to convert the relative cross-sections measured by the RIMS into absolute values. Using the combination of RIMS and RFT, ion collection and calibration errors were minimized. The results were compared with theoretical and experimental studies available in the literature. Previous electron impact experiments present relative cross-sections or use correction terms for the absolute cross-sections due to losses of energetic ions. We elucidate the differences between the new measurement method and the existing ones in the literature and explain why the present method can be considered reliable. Furthermore, we show how reducing correction terms affects the results.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Rev Sci Instrum Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Rev Sci Instrum Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos