Dissociative Recombination Measurements of NH+ Using an Ion Storage Ring

Novotný, O.; Becker, Arno; Buhr , H.; Domesle, C.; Geppert, W.; Grieser, M.; Krantz, C.; Kreckel, H.; Repnow, R.; Schwalm, D; Spruck, Kaija; Stützel, J; Yang , B.; Wolf, A.; Savin, D. W.

doi:10.1088/0004-637X/792/2/132

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Dissociative Recombination Measurements of NH⁺ Using an Ion Storage Ring

MPS-Authors

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Becker, Arno
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Domesle, C.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Grieser, M.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Krantz, C.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Kreckel, H.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Repnow, R.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Schwalm, D
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, D-35392 Giessen, Germany ;

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Spruck, Kaija
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Stützel, J
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA ;

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Wolf, A.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Citation

Novotný, O., Becker, A., Buhr, H., Domesle, C., Geppert, W., Grieser, M., et al. (2014). Dissociative Recombination Measurements of NH⁺ Using an Ion Storage Ring. The Astrophysical Journal, 792(2): 132. doi:10.1088/0004-637X/792/2/132.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0025-690F-F

Abstract

We have investigated dissociative recombination (DR) of NH+ with electrons using a merged beams configuration at the TSR heavy-ion storage ring located at the Max Planck Institute for Nuclear Physics in Heidelberg, Germany. We present our measured absolute merged-beams recombination rate coefficient for collision energies from 0 to 12 eV. From these data, we have extracted a cross section, which we have transformed to a plasma rate coefficient for the collisional plasma temperature range from Tpl = 10 to 18,000 K. We show that the NH+ DR rate coefficient data in current astrochemical models are underestimated by up to a factor of approximately nine. Our new data will result in predicted NH+ abundances lower than those calculated by present models. This is in agreement with the sensitivity limits of all observations attempting to detect NH+ in interstellar clouds.