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Title: DISSOCIATIVE RECOMBINATION MEASUREMENTS OF HCl{sup +} USING AN ION STORAGE RING

We have measured dissociative recombination (DR) of HCl{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 the measured absolute merged beams recombination rate coefficient for collision energies from 0 to 4.5 eV. We have also developed a new method for deriving the cross section from the measurements. Our approach does not suffer from approximations made by previously used methods. The cross section was transformed to a plasma rate coefficient for the electron temperature range from T = 10 to 5000 K. We show that the previously used HCl{sup +} DR data underestimate the plasma rate coefficient by a factor of 1.5 at T = 10 K and overestimate it by a factor of three at T = 300 K. We also find that the new data may partly explain existing discrepancies between observed abundances of chlorine-bearing molecules and their astrochemical models.
Authors:
; ;  [1] ; ; ; ; ; ; ; ; ; ;  [2] ;  [3] ;  [4]
  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)
  4. Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, D-35392 Giessen (Germany)
Publication Date:
OSTI Identifier:
22270623
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 777; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; APPROXIMATIONS; CHLORINE; COSMOCHEMISTRY; CROSS SECTIONS; ELECTRON TEMPERATURE; ELECTRON-ION COLLISIONS; ELECTRONS; ELEMENT ABUNDANCE; EV RANGE; HYDROCHLORIC ACID; MOLECULES; PLASMA; RECOMBINATION; STORAGE RINGS; TEMPERATURE DEPENDENCE