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

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
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 792; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
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