Excitation and charge transfer in low-energy hydrogen atom collisions with neutral manganese and titanium

Abstract

Data for inelastic processes due to hydrogen atom collisions with manganese and titanium are needed for accurate modeling of the corresponding spectra in late-type stars. In this work excitation and charge transfer in low-energy Mn+H and Ti+H collisions have been studied theoretically using a method based on an asymptotic two-electron linear combination of an atomic orbitals model of ionic-covalent interactions in the neutral atom-hydrogen-atom system, together with the multichannel Landau-Zener model to treat the dynamics. Extensive calculations of charge transfer (mutual neutralization, ion-pair production), excitation and de-excitation processes in the two collisional systems are carried out for all transitions between covalent states dissociating to energies below the first ionic limit and the dominating ionic states. Rate coefficients are determined for temperatures in the range 1000 - 20 000 K in steps of 1000 K. Like for earlier studies of other atomic species, charge transfer processes are found to lead to much larger rate coefficients than excitation processes.

arXiv comment9 pages, 3 figures, 5 tables; accepted for publication in A&A

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Cited by in corpus (5)

• The chemical make-up of the Sun: A 2020 vision
• The chemical composition of globular clusters in the Local Group
• Mutual neutralisation in Li${}^{+}$+H${}^{-}$/D${}^{-}$ and Na${}^{+}$+H${}^{-}$/D${}^{-}$ collisions: Implications of experimental results for non-LTE modelling of stellar spectra
• Titanium abundances in late-type stars I. 1D non-local thermodynamic equilibrium modelling in benchmark dwarfs and giants
• Revisiting inelastic Cu+H collisions and the non-LTE Galactic evolution of copper