Effect of the isotropic collisions with neutral hydrogen on the polarization of the CN solar molecule
| Autor: | H Asiri, M Derouich, S Qutub, François Lique, Y N Kalugina |
|---|---|
| Přispěvatelé: | Department of Astronomy [Jeddah], King Abdulaziz University, Department of Optics and Spectroscopy, Tomsk, Laboratoire Ondes et Milieux Complexes (LOMC), Centre National de la Recherche Scientifique (CNRS)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Normandie Université (NU) |
| Rok vydání: | 2019 |
| Předmět: |
Hydrogen
Atomic Physics (physics.atom-ph) chemistry.chemical_element FOS: Physical sciences 010402 general chemistry 01 natural sciences Physics - Atomic Physics Physics - Chemical Physics 0103 physical sciences Molecule Singlet state 010303 astronomy & astrophysics ComputingMilieux_MISCELLANEOUS Solar and Stellar Astrophysics (astro-ph.SR) Physics [PHYS]Physics [physics] Chemical Physics (physics.chem-ph) Scattering Isotropy Order (ring theory) Astronomy and Astrophysics Polarization (waves) Physics - Plasma Physics 0104 chemical sciences Plasma Physics (physics.plasm-ph) chemistry Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Atomic physics Ground state |
| 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, 2020, 491 (1), pp.1213-1226. ⟨10.1093/mnras/stz3020⟩ |
| ISSN: | 0035-8711 1365-2966 |
| DOI: | 10.48550/arxiv.1910.10058 |
| Popis: | Our work is concerned with the case of the solar molecule CN which presents conspicuous profiles of scattering polarization. We start by calculating accurate PES for the singlet and triplet electronic ground states in order to characterize the collisions between the CN molecule in its $X \; ^2\Sigma$ state and the hydrogen in its ground state $^2S$. The PES are included in the Schr\"oodinger equation to obtain the scattering matrix and the probabilities of collisions. Depolarizing collisional rate coefficients are computed in the framework of the infinite order sudden approximation for temperatures ranging from $T= 2000$ K to $T= 15000$ K. Interpretation of the results and comparison between singlet and triplet collisional rate coefficients are detailed. We show that, for typical photospheric hydrogen density ($n_{H} = 10^{15}-10^{16}$ cm$^{-3}$), the $X \; ^2\Sigma$ state of CN is partially or completely depolarized by isotropic collisions. Comment: Accepted for publication in MNRAS (Accepted October 22, 2019). 23 pages, 3 tables, 13 figures |
| Databáze: | OpenAIRE |
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