Radiative and nonradiative charge transfer in He(+) + H collisions at low energy

Physics – General Physics

Scientific paper

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46

Atomic Collisions, Charge Transfer, Helium Ions, Hydrogen Atoms, Ionic Collisions, Radiative Transfer, Electron States, Emission Spectra, Photons, Quantum Mechanics, Wave Functions

Scientific paper

Collisions of He(+) ions and neutral hydrogen atoms are important in a wide range of astrophysical environments. Calculations of the cross sections for direct and radiative processes are reported which occur in the collisions of He(+) with H at energies up to 100 eV. Rate coefficients for the removal of He(+) ions by radiative charge transfer and by radiative association are presented for temperatures up to 1000 K. Radiative association is the dominant mechanism at the low-energy extreme, and for collision energies above 10 meV radiative charge transfer is dominant. Above 8 eV the radiative processes are negligible, and direct charge transfer is the primary removal mechanism. The emission spectrum for radiative charge transfer has a main peak at wavelengths near 113 nm, corresponding to the energy difference between the A 1Sigma(+) and X 1Sigma(+) states of the molecular ion HeH(+) at large internuclear distances.

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