Hyperfine excitation of OH+by H

5 págs.; 4 figs.The OH ions are widespread in the interstellar medium and play an important role in the interstellar chemistry as they act as precursors to the HO molecule. Accurate determination of their abundance rely on their collisional rate coefficients with atomic hydrogen and electrons. In this paper, we derive OH-H fine and hyperfine-resolved rate coefficients by extrapolating recent quantum wave packet calculations for the OH+ + H collisions, including inelastic and exchange processes. The extrapolation method used is based on the infinite order sudden approach. State-to-state rate coefficients between the first 22 fine levels and 43 hyperfine levels of OH were obtained for temperatures ranging from 10 to 1000 K. Fine structure-resolved rate coefficients present a strong propensity rule in favour of δj = δN transitions. The δj = δF propensity rule is observed for the hyperfine transitions. The new rate coefficients will help significantly in the interpretation of OH spectra from photon-dominated region (PDR), and enable the OH molecule to become a powerful astrophysical tool for studying the oxygen chemistry.This work has been supported by the Agence Nationale\udde la Recherche (ANR-HYDRIDES), contract ANR-12-BS05-\ud0011-01 and by the CNRS national program ‘Physique et\udChimie du Milieu Interstellaire’. FL thank the CPER Haute-\udNormandie/CNRT/Energie, Electronique,Materiaux. NB acknowledge\udthe support by Scientific Research Projects Coordination\udUnit of Firat University (Project No: FF.15.03) and by TUBITAK\ud(TBAG-112T827). OR acknowledge the support from Ministerio\udde Economía y Competitividad under grants. no. CSD2009-00038\udand FIS2014-52172-C2.Peer Reviewe