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Absolute cross sections and kinetic energy release distributions for electron-impact ionization and dissociation of CD4+

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Lecointre, Julien [UCL] Belic, D. S. Jureta, Jozo [UCL] Janev, R. Defrance, Pierre [UCL]

Absolute cross sections for electron-impact dissociative excitation and ionization of CD4+ leading to formation of ionic products (CD42+, CD3+, CD2+, CD+, C+, D-3(+), D-2(+), and D+) have been measured. The animated crossed-beams method is applied in the energy range from the reaction threshold up to 2.5 keV. Around 100 eV, the maximum cross sections are found to be (3.8 +/- 0.2) x 10(-1)9 cm(2), (10.8 +/- 1.5) x 10(-17) cm(2), (7.1 +/- 0.8) x 10(-17) cm(2), (9.0 +/- 0.8) x 10(-17) cm(2) and (3.7 +/- 0.4) x 10(-17) cm(2) for the heavy carbonaceous ions CD42+, CD3+, CD2+, CD+ and C+ respectively. For the light fragments, D-3(+), D-2(+), and D+, the cross sections around the maximum are found to be (5.0 +/- 0.6) x 10(-19) cm(2), (1.7 +/- 0.2) x 10(-17) cm(2) and (10.6 +/- 1.0) x 10(-17) cm(2), respectively. The cross sections are presented in closed analytic forms convenient for implementation in plasma simulation codes. The analysis of ionic product velocity distributions allows determination of the kinetic energy release distributions which are seen to extend from 0 to 9 eV for heavy fragments, and up to 14 eV for light ones. The comparison of present energy thresholds and kinetic energy release with available published data gives information about states contributing to the observed processes. Individual contributions for dissociative excitation and dissociative ionization are determined for each detected product. A complete database including cross sections and energies is compiled for use in fusion application.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2008
Language Anglais
Journal information "European Physical Journal D. Atomic, Molecular, Optical and Plasma Physics" - Vol. 50, no. 3, p. 265-278 (2008)
Peer reviewed yes
Publisher Springer (New York)
issn 1434-6060
e-issn 1434-6079
Publication status Publié
Affiliation UCL - SC/PHYS - Département de physique
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Bibliographic reference Lecointre, Julien ; Belic, D. S. ; Jureta, Jozo ; Janev, R. ; Defrance, Pierre. Absolute cross sections and kinetic energy release distributions for electron-impact ionization and dissociation of CD4+. In: European Physical Journal D. Atomic, Molecular, Optical and Plasma Physics, Vol. 50, no. 3, p. 265-278 (2008)
Permanent URL http://hdl.handle.net/2078.1/35867