Abstract
A full theoretical treatment including an ab-initio molecular calculation of the potential energy curves and couplings followed by a semi-classical collision dynamics has been performed for the one-electron capture by S3+ ions in collision with atomic hydrogen. The present paper completes a previous letter [9] and displays the full results concerning this process in order to provide a detailed understanding of the mechanism. These calculations show evidence of the predominance of the S2+(3s23p3d)3F° capture level, already pointed out by translational energy spectroscopy experiments and confirms experimental measurements. A compared study of the behaviour of the S3+ projectile colliding both hydrogen and helium targets is also presented.
Highlights
IntroductionAn accurate understanding of the emergent spectra requires a detailed modelling of the atomic and molecular processes affecting conditions in the gas, as collisional excitation, photodissociation, and charge transfer processes which appear to be essential for the determination of the ion abundances and ionization balance of the plasmas [1,2,3]
The charge transfer recombination involving low-energy multiply charged ions in collision with atomic or molecular targets is an important process in astrophysical plasmas for many low charged ions whose emission lines are used to provide direct information on the ionization structure ofInt
An accurate understanding of the emergent spectra requires a detailed modelling of the atomic and molecular processes affecting conditions in the gas, as collisional excitation, photodissociation, and charge transfer processes which appear to be essential for the determination of the ion abundances and ionization balance of the plasmas [1,2,3]
Summary
An accurate understanding of the emergent spectra requires a detailed modelling of the atomic and molecular processes affecting conditions in the gas, as collisional excitation, photodissociation, and charge transfer processes which appear to be essential for the determination of the ion abundances and ionization balance of the plasmas [1,2,3]. The calculation has been performed for the ground state S3+(3s23p)2P° + H entry channel only ; the metastable ion S3+(3s3p2)4P evidenced in the ion beam, has not been taken into account in this study These results may be compared to our previous work on the S3+ + He charge transfer process [8] using the CIPSI algorithm for the molecular treatment followed by a semi-classical collision dynamics
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