Charge transfer of O++ and Ne++ with H

Calculations are reported of the potentail-energy surfaces of the molecules OH++ and NeH++. Avoided crossins occur in the 4Σ- and 4Pi states of OH++ through which the charge-transfer reaction O+++ H→O++H+ can proceed at thermal energies. The Landau-Zener approximation leads to a rate coefficient of 6 x 10-10 cm3 s-1 at a temperature of 104 K. No such crossings occur for NeH++, and the charge transfer process Ne+++H→Ne++H is slow at thermal energies. The calculations establish that charge transfer affects significantly the distribution of O cI in astrophysical plasmas but not that of Ne II. The oxygen charge-transfer process leads to an excited state of O II which decays by line emission at 834 A