Theoretical study of ArH+ dissociative recombination and electron-impact vibrational excitation
| Autor: | Jonathan Tennyson, D. A. Little, Youssef Moulane, J. Zs. Mezei, A. Abdoulanziz, E. Roueff, F. Colboc, I. F. Schneider, Vincenzo Laporta |
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| Přispěvatelé: | Laboratoire Ondes et Milieux Complexes (LOMC), Centre National de la Recherche Scientifique (CNRS)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Normandie Université (NU), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Department of Physics and Astronomy [UCL London], University College of London [London] (UCL) |
| Rok vydání: | 2018 |
| Předmět: |
Atomic Physics (physics.atom-ph)
FOS: Physical sciences Electron 01 natural sciences 7. Clean energy Physics - Atomic Physics Quantum defect 0103 physical sciences Molecule 010306 general physics 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) ComputingMilieux_MISCELLANEOUS Dissociative recombination Electron ionization [PHYS]Physics [physics] Physics Polyatomic ion Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies 3. Good health Interstellar medium Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Atomic physics Excitation |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2018, 479 (2), pp.2415-2420. ⟨10.1093/mnras/sty1549⟩ |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/sty1549 |
| Popis: | Cross sections are presented for dissociative recombination and electron-impact vibrational excitation of the ArH+ molecular ion at electron energies appropriate for the interstellar environment. The R-matrix method is employed to determine the molecular structure data, i.e. the position and width of the resonance states. The cross sections and the corresponding Maxwellian rate coefficients are computed using a method based on the Multichannel Quantum Defect Theory. The main result of the paper is the very low dissociative recombination rate found at temperatures below 1000K. This is in agreement with the previous upper limit measurement in merged beams and offers a realistic explanation to the presence of ArH+ in exotic interstellar conditions. 6 pages; 7 figures |
| Databáze: | OpenAIRE |
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