Physics – General Physics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phrva..40.2340z&link_type=abstract
Physical Review A - General Physics, 3rd Series (ISSN 0556-2791), vol. 40, Sept. 1, 1989, p. 2340-2345. Research supported by th
Physics
General Physics
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.
Dalgarno Alexander
Kimura Masahiro
Lane Neal F.
Zygelman Bernard
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