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Competition between Reaction Channels in Electron Collisions of the Hydrogen Molecular Ion HD+

Lange, Michael

German Title: Konkurrenz zwischen Reaktionskanälen bei Elektronenstößen mit dem Wasserstoff-Molekülion HD+

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Translation of abstract (English)

The energy-differential cross-section of dissociative recombination of the HD+ molecular ion (HD+ + e -> H + D) was measured with high precision and on an absolute scale, at the heavy-ion storage ring TSR (Max-Planck-Institut für Kernphysik). The measured cross-section shows a previously unknown structure at electron energies between 1-3 eV, in correlation with the energy thresholds for the opening of additional channels in the dissociation of the intermediate neutral HD molecule. This was explained by autoionization, a process competing with dissociation, and which is related to the number of closed channels. In another experiment, first evidence was observed for vibrational excitation of initially relaxed molecular ions being stored in a heavy-ion storage ring. These processes were attributed to collisions of the stored ions with slow electrons from the ring's electron cooling device, or with molecules from the dilute residual gas in the TSR vacuum system.

Document type: Dissertation
Supervisor: Wolf, Prof. Andreas
Date of thesis defense: 27 June 2001
Date Deposited: 13 Sep 2001 00:00
Date: 2001
Faculties / Institutes: Service facilities > Max-Planck-Institute allgemein > MPI for Nuclear Physics
DDC-classification: 530 Physics
Controlled Keywords: Elektron-Molekül-Stoß, Elektronenanlagerungsreaktion, Dissoziative Rekombination, Wasserstoff, Molekülion
Uncontrolled Keywords: TSRmolecule , electron , dissociative recombination , storage ring , hydrogen
Additional Information: Teile in: M. Lange, J. Levin, G. Gwinner, U. Hechtfischer, L. Knoll, D. Schwalm, R. Wester, A. Wolf, X. Urbain, D. Zajfman, Phys. Rev. Lett. 83, p. 4979 (1999).
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