Eur. Phys. J. D (2012) 66: 218
https://doi.org/10.1140/epjd/e2012-30064-x

Regular Article

Electron-impact dissociation and ionization of OH⁺ and OD⁺ ions

¹ Faculty of Physics, University of Belgrade, PO Box 386, 11000 Belgrade, Serbia
² Institute of Physics, PO Box 68, 11081 Belgrade, Serbia
³ Université Catholique de Louvain, Institute of Condensed Matter and Nanosciences, Chemin du Cyclotron 2, 1348 Louvain-la-Neuve, Belgium
⁴ Haute École Namur-Liège-Luxembourg HENALLUX, Département Ingénieur Industriel, Pierrard, Rue d’Arlon 112, 6760 Virton, Belgium
⁵ Faculté des Sciences et Techniques, BP 2202, Route d’Imouzzer, 30000 Fès, Morocco
⁶ Faculté Polydisciplinaire, BP 4162, Route de Sidi Bouzid, 46000 Safi, Morocco

^a e-mail: julien.lecointre@henallux.be

Received: 25 January 2012
Received in final form: 22 May 2012
Published online: 28 August 2012

Abstract

Absolute cross sections for electron impact ionization and dissociation of OH⁺ and OD⁺ leading to the formation of the OH²⁺, O⁺, O²⁺, O³⁺ and D⁺ ions have been measured by applying the animated electron-ion beam method in the energy range from the respective reaction thresholds up to 2.5 keV. The maximum of the single ionization cross section is found to be (0.95  ±  0.02)  ×  10^-19 cm² at 155 eV. The maximum total cross sections for O⁺ and D⁺ fragments production are observed to be (15.7  ±  0.2)  ×  10^-17 cm² at 95 eV and (10.8  ±  0.5)  ×  10^-17 cm² at 95 eV, respectively. The cross sections for O²⁺ and O³⁺ are much smaller, (5.37  ±  0.04)  ×  10^-18 cm² at 135 eV and (7.95  ±   0.23)  ×  10^-20 cm² at 315 eV, respectively. The collected data are analyzed in details in order to determine separately the contributions of dissociative excitation and of dissociative ionization to the O⁺ and D⁺ fragments production.