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          Document History for Document ID 207894

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Document Version Version Comment Date Status
207894.0 [No comment] 28.02.2005 13:59 Released

ID: 207894.0, MPI für Kernphysik / Spectroscopy and Dynamics of Trapped and Stored Ions
Storage ring studies on dissociative recombination and internal excitation of helium dimer ions
Authors:Pedersen, H.; Buhr, H.; Altevogt, S.; Andrianarijaona, V.; Kreckel, H.; Lammich, L.; de Ruette, N.; Staicu-Casagrande, E.; Schwalm, D.; Strasser, D.; Urbain, X.; Zajfman, D.; Wolf, A.
Language:English
Date of Publication (YYYY-MM-DD):2005
Title of Journal:Journal of Physics: Conference Series
Volume (in Journal):4
Start Page:168
End Page:176
Name of Conference/Meeting:SIXTH INTERNATIONAL CONFERENCE ON DISSOCIATIVE RECOMBINATION: THEORY, EXPERIMENTS AND APPLICATIONS
Place of Conference/Meeting:Mosbach, Germany
(Start) Date of Conference/Meeting
 (YYYY-MM-DD):
2004-06-12
End Date of Conference/Meeting 
 (YYYY-MM-DD):
2004-06-16
Copyright:Copyright © Institute of Physics and IOP Publishing Limited 2005.
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:The dissociative recombination (DR) of the helium dimer 3He 4He+ has been investigated at the heavy-ion Test Storage Ring (TSR) in Heidelberg at relative energies up to 40 eV. The vibrational level population in the stored ion beam was shown to be non-thermal with a fraction of 0.1-1% in higher vibrational states, resulting mainly from vibrational excitation in collisions with the residual gas species. The temporal evolution of the DR rate during storage showed evidence for an electron induced rotational de-excitation from the vibrational ground state. After characterizing the evolution of the rovibrational population of the stored ions, the zero energy DR rate coefficient was extracted from the measurement to be αv=0DR (0)=(7.3 ± 2.1) × 10-10 cm3/s, and the DR reaction from the vibrational ground state was seen to proceed mainly to the 1s2s 1S and 1s2p3P atomic limits. For v ≥ 3, the DR reaction has a rate coefficient ≥ 2 × 10-7 cm3/s and leads primarily to atomic fragments with n ≥ 3. The energy dependent rate coefficient displays several prominent structures.
External Publication Status:published
Document Type:Conference-Paper
Affiliations:MPI für Kernphysik/Group D. Schwalm/Atomic and Molecular Physics with Stored Ions (A. Wolf)
External Affiliations:Département de Physique, Université catholique de Louvain, B1348, Louvain-la-Neuve, Belgium
Department of Particle Physics, Weizmann Institute of Science, Rehovot, 76100, Israel