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Title: Dissociative recombination measurements of NH{sup +} using an ion storage ring

Abstract

We have investigated dissociative recombination (DR) of NH{sup +} 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 T {sub pl} = 10 to 18,000 K. We show that the NH{sup +} 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{sup +} abundances lower than those calculated by present models. This is in agreement with the sensitivity limits of all observations attempting to detect NH{sup +} in interstellar clouds.

Authors:
;  [1]; ; ; ; ; ; ; ; ; ; ; ;  [2];  [3]
  1. Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027 (United States)
  2. Max Planck Institute for Nuclear Physics, D-69117 Heidelberg (Germany)
  3. Department of Physics, Stockholm University, AlbaNova, SE-106 91, Stockholm (Sweden)
Publication Date:
OSTI Identifier:
22365071
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 792; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; ASTROPHYSICS; COLLISIONAL PLASMA; COLLISIONS; CONFIGURATION; COSMIC GASES; CROSS SECTIONS; ELEMENT ABUNDANCE; EV RANGE; HEAVY IONS; INTERSTELLAR SPACE; MOLECULAR IONS; MOLECULES; NITROGEN HYDRIDES; RECOMBINATION; SENSITIVITY; STORAGE RINGS

Citation Formats

Novotný, O., Savin, D. W., Berg, M., Bing, D., Buhr, H., Grieser, M., Grussie, F., Krantz, C., Mendes, M. B., Nordhorn, C., Repnow, R., Schwalm, D., Yang, B., Wolf, A., and Geppert, W., E-mail: oldrich.novotny@mpi-hd.mpg.de. Dissociative recombination measurements of NH{sup +} using an ion storage ring. United States: N. p., 2014. Web. doi:10.1088/0004-637X/792/2/132.
Novotný, O., Savin, D. W., Berg, M., Bing, D., Buhr, H., Grieser, M., Grussie, F., Krantz, C., Mendes, M. B., Nordhorn, C., Repnow, R., Schwalm, D., Yang, B., Wolf, A., & Geppert, W., E-mail: oldrich.novotny@mpi-hd.mpg.de. Dissociative recombination measurements of NH{sup +} using an ion storage ring. United States. doi:10.1088/0004-637X/792/2/132.
Novotný, O., Savin, D. W., Berg, M., Bing, D., Buhr, H., Grieser, M., Grussie, F., Krantz, C., Mendes, M. B., Nordhorn, C., Repnow, R., Schwalm, D., Yang, B., Wolf, A., and Geppert, W., E-mail: oldrich.novotny@mpi-hd.mpg.de. Wed . "Dissociative recombination measurements of NH{sup +} using an ion storage ring". United States. doi:10.1088/0004-637X/792/2/132.
@article{osti_22365071,
title = {Dissociative recombination measurements of NH{sup +} using an ion storage ring},
author = {Novotný, O. and Savin, D. W. and Berg, M. and Bing, D. and Buhr, H. and Grieser, M. and Grussie, F. and Krantz, C. and Mendes, M. B. and Nordhorn, C. and Repnow, R. and Schwalm, D. and Yang, B. and Wolf, A. and Geppert, W., E-mail: oldrich.novotny@mpi-hd.mpg.de},
abstractNote = {We have investigated dissociative recombination (DR) of NH{sup +} 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 T {sub pl} = 10 to 18,000 K. We show that the NH{sup +} 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{sup +} abundances lower than those calculated by present models. This is in agreement with the sensitivity limits of all observations attempting to detect NH{sup +} in interstellar clouds.},
doi = {10.1088/0004-637X/792/2/132},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 792,
place = {United States},
year = {2014},
month = {9}
}