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  Assignment of resonances in dissociative recombination of HD+ ions: high-resolution measurements compared with accurate computations

Waffeu Tamo, F. O., Buhr, H., Motapon, O., Altevogt, S., Andrianarijaona, V., Grieser, M., et al. (2011). Assignment of resonances in dissociative recombination of HD+ ions: high-resolution measurements compared with accurate computations. Physical Review. A, 84(2): 022710. Retrieved from http://arxiv.org/abs/1107.5267.

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1107.5267 (Preprint), 2MB
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1107.5267
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Waffeu Tamo, F. O. 1, 2, 3, Author
Buhr, Hendrik4, 5, Author           
Motapon, O.5, Author
Altevogt, Simon4, Author           
Andrianarijaona, V.4, Author           
Grieser, Manfred4, Author           
Lammich, Lutz4, Author           
Lestinsky, Michael4, Author           
Motsch, Michael4, Author           
Nevo, I.6, Author
Novotny, Steffen4, Author           
Orlov, Dmitry A.4, Author           
Pedersen, H. B.4, Author           
Schwalm, Dirk4, Author           
Sprenger, Frank4, Author           
Urbain, X.7, Author
Weigel, Udo4, Author           
Wolf, Andreas4, Author           
Schneider, I. F.1, Author
Affiliations:
1Université du Havre, France , ou_persistent22              
2CEPAMOQ, University of Douala, Cameroon, ou_persistent22              
3Observatoire de Paris, France, ou_persistent22              
4Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society, Saupfercheckweg 1, 69117 Heidelberg, DE, ou_904548              
5LPF, University of Douala, Cameroon, ou_persistent22              
6Weizmann Institute of Science, Rehovot, Israel, ou_persistent22              
7Université catholique de Louvain, Belgium), ou_907546              

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Free keywords: Physics, Atomic Physics, physics.atom-ph, Physics, Chemical Physics, physics.chem-ph
 Abstract: The collision-energy resolved rate coefficient for dissociative recombination of HD+ ions in the vibrational ground state is measured using the photocathode electron target at the heavy-ion storage ring TSR. Rydberg resonances associated with ro-vibrational excitation of the HD+ core are scanned as a function of the electron collision energy with an instrumental broadening below 1 meV in the low-energy limit. The measurement is compared to calculations using multichannel quantum defect theory, accounting for rotational structure and interactions and considering the six lowest rotational energy levels as initial ionic states. Using thermal equilibrium level populations at 300 K to approximate the experimental conditions, close correspondence between calculated and measured structures is found up to the first vibrational excitation threshold of the cations near 0.24 eV. Detailed assignments, including naturally broadened and overlapping Rydberg resonances, are performed for all structures up to 0.024 eV. Resonances from purely rotational excitation of the ion core are found to have similar strengths as those involving vibrational excitation. A dominant low-energy resonance is assigned to contributions from excited rotational states only. The results indicate strong modifications in the energy dependence of the dissociative recombination rate coefficient through the rotational excitation of the parent ions, and underline the need for studies with rotationally cold species to obtain results reflecting low-temperature ionized media.

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 Dates: 2011-07-262011-08-19
 Publication Status: Issued
 Pages: 15 pages, 10 figures. Paper to appear in Phys. Rev. A (version as accepted)
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 1107.5267
URI: http://arxiv.org/abs/1107.5267
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Title: Physical Review. A
  Other : Phys. Rev. A
Source Genre: Journal
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Publ. Info: New York, NY : Published by the American Physical Society through the American Institute of Physics
Pages: - Volume / Issue: 84 (2) Sequence Number: 022710 Start / End Page: - Identifier: ISSN: 1050-2947
CoNE: https://pure.mpg.de/cone/journals/resource/954925225012_2