Dissociative recombination measurements of HCl+ using an ion storage ring

Abstract

We have measured dissociative recombination of HCl+ with electrons using a merged beams configuration at the heavy-ion storage ring TSR 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+ DR data underestimate the plasma rate coefficient by a factor of 1.5 at T=10 K and overestimate it by a factor of 3.0 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.

Accepted for publication in ApJ (July 7, 2013)

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• Recommended Thermal Rate Coefficients for the C + H${}_3^{+}$ Reaction and Some Astrochemical Implications
• Dissociative Recombination of Rotationally Cold OH${}^{+}$ and Its Implications for the Cosmic Ray Ionization Rate in Diffuse Clouds
• Dissociative recombination measurements of NH${}^{+}$ using an ion storage ring
• The chemistry of chlorine-bearing species in the diffuse interstellar medium, and new SOFIA/GREAT observations of HCl${}^{+}$
• Cl+ and HCl+ in Reaction with H2 and Isotopologues: A Glance into H Abstraction and Indirect Exchange at Astrophysical Conditions