Rotational Excitation of HD by Hydrogen Revisited
| Autor: | Benjamin Desrousseaux, François Lique, M. V. Kazandjian, Carla Maria Coppola |
|---|---|
| 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) |
| Rok vydání: | 2018 |
| Předmět: |
[PHYS]Physics [physics]
Hydrogen exchange Hydrogen Chemistry Scattering media_common.quotation_subject chemistry.chemical_element 7. Clean energy 01 natural sciences Molecular physics Universe 13. Climate action 0103 physical sciences Radiative transfer Molecule [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] Astrophysics::Earth and Planetary Astrophysics Physical and Theoretical Chemistry [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] 010306 general physics 010303 astronomy & astrophysics Quantum ComputingMilieux_MISCELLANEOUS Excitation media_common |
| Zdroj: | Journal of Physical Chemistry A Journal of Physical Chemistry A, American Chemical Society, 2018, 122 (42), pp.8390-8396. ⟨10.1021/acs.jpca.8b08618⟩ |
| ISSN: | 1520-5215 1089-5639 |
| DOI: | 10.1021/acs.jpca.8b08618 |
| Popis: | The HD molecules are key species for the cooling of pristine gas at temperatures below 100 K. They are also known to be key tracers of H2 in protoplanetary disks and thus, they can be used as a measure of protoplanetary disks mass. Accurate modeling of the cooling mechanism and of HD abundance in astrophysical media requires a proper modeling for its excitation by both radiative and collisional processes. Here, we report quantum time-independent calculations of collisional rate coefficients for the rotational excitation of HD by H for temperatures ranging from 10 to 1000 K. The reactive and hydrogen exchange channels are taken into account in the scattering calculations. New exact quantum results are compared to previous calculations performed neglecting reactive and exchange channels. We found that for temperatures higher than ∼300 K, the impact of these channels on the rate coefficients cannot be neglected. Such results suggest that the new HD-H collisional data have to be used for properly modeling HD cooling function and HD abundance in all the astrophysical environments where HD plays a role, e.g. in photon-dominated regions, protoplanetary disks, early Universe chemistry, and primordial star forming regions. |
| Databáze: | OpenAIRE |
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