Charge transfer processes due to collisions of ground state Si 3+ ͑3s 1 S͒ ions with atomic hydrogen are investigated using the quantum-mechanical molecular-orbital close-coupling ͑MOCC͒ and classical-trajectory Monte Carlo ͑CTMC͒ methods. The MOCC calculations utilize ab initio adiabatic potentials and nonadiabatic radial coupling matrix elements obtained from Herrero et al. ͓J. Phys. B 29, 5583 ͑1996͔͒ which were calculated with a full configuration-interaction method. Total and state-selective single-electron capture cross sections are obtained for collision energies from 0.01 eV/ u to 1 MeV/ u. Total and state-selective rate coefficients are also presented for temperatures from 2 ϫ 10 3 K to 10 7 K. Comparison with existing data reveals that the total CTMC cross sections are in good agreement with the experimental measurements at the higher considered energies and that previous Landau-Zener calculations underestimate the total rate coefficients by a factor of up to two. The CTMC calculations of target ionization are presented for high energies.
The process of mutual neutralization of H3+ and H− ions in the CM
collision energy range 0.1 eV/u–10 keV/u is studied within the
multi-channel Landau-Zener model. From the multitude of covalent H3* + H(1s) states only the states (2s)2A′1, (3s)2A′1 and
(3d)2A′1 are strongly coupled with the initial ionic H3+ +H− state. The total mutual-neutralization cross-section has a broad maximum
around ECM = 1 keV/u of about 3 × 10−15 cm2, and below
∼ 100 eV/u it monotonically increases with decreasing the collision
energy, surpassing a value of ∼ 3 × 10−13 cm2 below ECM = 0.1 eV/u. The mutual neutralization of H3+ and H− ions
is, therefore, an important process in cold hydrogen plasmas.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.