Collisional excitation of HD by H
In: ISSN: 0035-8711, 2022
Online
academicJournal
Zugriff:
International audience ; The HD molecule plays an important role in many astrophysical environments. Accurate modelling of the gas cooling induced by HD and its abundance in such media requires a proper modelling of its excitation by both radiative and collisional processes. Reliable state-to-state collisional rate coefficients in extended temperature regimes are then essential to allow for the description of different astrophysical environments where deviations from local thermodynamic equilibrium regime can occur. Here, we report exact quantum time-independent reactive scattering calculations for the rovibrational excitation of HD by H. Rate coefficients are computed for temperatures up to 5000 K and transitions between all rovibrational states with internal energies up to 14 000 cm(-1). Previous results neglecting reactive and exchange channels of the colliding system are compared to the new ones and significant differences are found. The present work represent a big step in the complete description of the HD-H collisional system, in terms of rovibrational states considered, temperature range explored and accuracy. Hence, we recommend the use of the new HD-H collisional data presented here to accurately model the astrophysical environments where HD plays a role.
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Collisional excitation of HD by H
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Autor/in / Beteiligte Person: | Desrousseaux, Benjamin ; Coppola, Carla Maria ; Lique, François ; Institut de Physique de Rennes (IPR) ; Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS) ; Università degli studi di Bari Aldo Moro = University of Bari Aldo Moro (UNIBA) ; European Research Council 811363 ; PHC GALILEE 39379SF (Bando Galileo 2018-G18_92) ; Programme National 'Physique et Chimie du Milieu Interstellaire' (PCMI) of CNRS/INSU with INC/INP -, CEA ; CNES ; Institut Universitaire de France ; Regione Puglia for the project 'Intervento cofinanziato dal Fondo di Sviluppo e Coesione 2007-2013 - APQ Ricerca Regione Puglia - Programma regionale a sostegno della specializzazione intelligente e della sostenibilita sociale ed ambientale - FutureInResea |
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Zeitschrift: | ISSN: 0035-8711, 2022 |
Veröffentlichung: | HAL CCSD ; Oxford University Press (OUP): Policy P - Oxford Open Option A, 2022 |
Medientyp: | academicJournal |
DOI: | 10.1093/mnras/stac911 |
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