DISSOCIATIVE RECOMBINATION MEASUREMENTS OF HCl+ USING AN ION STORAGE RING
2013 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 777, no 1, 54- p.Article in journal (Refereed) Published
We have measured dissociative recombination (DR) of HCl+ 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+ 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.
Place, publisher, year, edition, pages
2013. Vol. 777, no 1, 54- p.
astrochemistry, ISM: clouds, ISM: molecules, methods: laboratory: molecular, molecular data, molecular processes
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-96868DOI: 10.1088/0004-637X/777/1/54ISI: 000326147300054OAI: oai:DiVA.org:su-96868DiVA: diva2:668281
NSF Division of Astronomical Sciences Astronomy and Astrophysics Grants program; NASA Astronomy and Physics Research and Analysis Program; Weizmann Institute of Science through the Joseph Meyerhoff program; German-Israeli Foundation for Scientific Research (GIF) I-900-231.7/2005; COST Action; CM0805; MPG; CAS-MPS program; DFG; Max Planck Society 2013-11-292013-11-282013-11-29Bibliographically approved