Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 23: Poster: Electron scattering and recombination
A 23.6: Poster
Dienstag, 13. März 2012, 16:30–19:00, Poster.V
Electron induced double and triple fragmentation of CH4 — •Xueguang Ren, Thomas Pflueger, Shenyue Xu, Arne Senftleben, Alexander Dorn, and Joachim Ullrich — Max-Planck-Institut fuer Kernphysik , 69117 Heidelberg, Germany
Collisions of energetic electrons with molecules that induce chemical and physical reactions are of fundamental importance for a range of areas from plasma physics to radiation damage in living tissue. The study of dissociative ionization of molecules where the molecular ion is fragmenting can provide detailed insight into the molecular reaction dynamics. The fragmentation process of small polyatomic molecules has been extensively investigated for which one electron of the target molecule is ionized resulting in some dissociating states, see e.g. [1]. In this work, the fragmentation cross sections of doubly or triply charged methane induced by 130 eV electron impact has been measured using the reaction microscope, in which the momentum vectors of all charged particles emerging from the collision are measured in coincidence and detected in 4π solid angle. Therefore, the information of the kinetic energy of fragments is determined to get insight into its breakup mechanism. The sensitivity of the experimental method enable us to extend the study of the fragmentation pattern of CH42+ to include small breakup channels such as H3+ + CH+. Furthermore, some breakup channels of the triply charged CH43+ have been detected as triple coincidence. [1] S. Xu, et al., Phys. Rev. A 83, 052702 (2011).