Absolute cross-sections and kinetic-energy-release distributions for electron-impact ionization and dissociation of CD2+

Molecular processes play a crucial role in the edge plasma kinetics of magnetic fusion devices. Absolute cross-sections have been measured for electron-impact dissociative excitation and ionization of CD2+ leading to formation of CD22+, CD+, C+, D2+ and D+. The animated crossed-beams method is applied in the energy range from the reaction threshold up to 2.5 keV. The maximum total cross-sections are found to be (1.2 ± 0.1)*10-17 cm2, (6.1 ± 0.7)*10-17 cm2, (6.4 ± 0.7)*10-17 cm2, (26.3 ± 3.8)*10-19 cm2 and (14.9 ± 1.4)*10-17 cm2 for CD22+, CD+, C+, D2+ and D+ respectively. Individual contributions for dissociative excitation and dissociative ionization are determined for each singly-charged product, which are of significant interest in fusion plasma edge modelling and diagnostics. Conforming to the scheme recently applied in the CD4+ and in the CD3+ articles, the cross-sections are presented in closed analytic forms convenient for implementation in plasma simulation codes. Kinetic energy release distributions are determined for each ionic fragment at selected electron energies. (authors)