Dissociative recombination measurements of NH$^+$ using an ion storage ring
| Autor: | Henrik Buhr, B. Yang, Dennis Bing, Max H. Berg, D. Schwalm, Claude Krantz, Roland Repnow, M. B. Mendes, Daniel Wolf Savin, Wolf D. Geppert, Florian Grussie, Alexander Wolf, O. Novotný, Manfred Grieser, Christian Nordhorn |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Physics
Range (particle radiation) Ion recombination Atomic Physics (physics.atom-ph) FOS: Physical sciences Quantendynamik - Abteilung Blaum Astronomy and Astrophysics Electron Plasma Astrophysics Ion Physics - Atomic Physics Storage rings Cross section (physics) Cosmochemistry Space and Planetary Science Electron temperature Atomic physics Astrophysics - Instrumentation and Methods for Astrophysics Instrumentation and Methods for Astrophysics (astro-ph.IM) Dissociative recombination Storage ring |
| Zdroj: | The Astrophysical Journal |
| DOI: | 10.48550/arxiv.1407.0538 |
| Popis: | We have investigated dissociative recombination (DR) of NH$^+$ 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 $T_{\rm pl} = 10$ to $18000$ K. We show that the NH$^+$ DR rate coefficient data in current astrochemical models are underestimated by up to a factor of $\sim 9$. Our new data will result in predicted NH$^+$ abundances lower than calculated by present models. This is in agreement with the sensitivity limits of all observations attempting to detect NH$^+$ in interstellar clouds. Comment: July 1st 2014: Accepted for publication in ApJ |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|