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An Electron Target for Collision Experiments with Trapped Ions

Witte, Peter Daniel

German Title: Ein Elektonentarget fuer Stossexperimente mit gespeicherten Ionen

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Translation of abstract (English)

An Electron Target for Collision Experiment with Trapped Ions An experiment to study electron collisions on stored molecular ions has been built within the framework of this thesis. Ions are stored in a trap with a kinetic energy of several keV between two electrostatic mirrors. The stored ions are crossed at right angle by the low-energy (5-50 eV) electron beam. With this setup, both a relaxation of internal excitation of the molecular ion and an efficient detection of fragments can be achieved. An additional advantage is that the ion trapping field as well as the electron guiding field are electrostatic only, and thus no limitation on the mass of the stored ion is imposed. Experiments on very heavy clusters become accessible. Based on simulations, an electron target was designed and constructed to provide the necessary electron beam. Upon first test measurements, the electron target was installed into an existing ion trap at the Weizmann Institute of Science. After commissioning and functioning tests, first measurements on electron collision processes were performed for positive (Ar+ und CO+) and negative ions (C-, B- and C2-) that show the operativeness of this new experimental approach.

Item Type: Dissertation
Supervisor: Wolf, Prof. Andreas
Date of thesis defense: 16 October 2002
Date Deposited: 24 Oct 2002 00:00
Date: 2002
Faculties / Institutes: Service facilities > Max-Planck-Institute allgemein > MPI for Nuclear Physics
Subjects: 530 Physics
Controlled Keywords: Elektron-Molekül-Stoß, Ionenfalle, Elektronenstrahl
Uncontrolled Keywords: electrostatic ion trap , electron target , electron-ion collisions
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