Charge transfer of Si/2 plus/ ions with atomic hydrogen in the interstellar medium

Details Charge transfer of Si/2 plus/ ions with atomic hydrogen in the interstellar medium Charge transfer of Si/2 plus/ ions with atomic hydrogen in the interstellar medium

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....53...83m&link_type=abstract

Astronomy and Astrophysics, vol. 53, no. 1, Nov. 1976, p. 83-88.

Astronomy and Astrophysics

Astrophysics

57

Charge Transfer, Electron Capture, Hydrogen Atoms, Interstellar Chemistry, Ionic Reactions, Silicon, Atomic Collisions, Charge Exchange, Potential Energy, Radiative Recombination, Reaction Kinetics, S Matrix Theory

Scientific paper

Potential energies of relevant electronic states are computed as a function of internuclear distance for SiH(2 plus) using a model potential method that ensures a good description of the molecule at intermediate and large internuclear distances. The cross section for the charge-exchange reaction Si(2 plus) plus H yields Si(plus) plus H(plus) is then calculated in terms of the molecular model of atomic collisions, and the quantum-mechanical scattering equations describing the collisions are solved to obtain the scattering S-matrix. The results for the energy range from 3 to 30,000 K indicate that the cross section can attain large values at thermal energies, that resonance effects dominate the cross section below 10 K, and that the reaction rate is almost constant in the range from 10 to 300 K. It is concluded that electron capture of Si(2 plus) in diffuse interstellar clouds occurs primarily via charge exchange rather than radiative recombination

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