Atomic data for neutron-capture elements III. Charge transfer rate
  coefficients for low-charge ions of Ge, Se, Br, Kr, Rb, and Xe
  We present total and final-state resolved charge transfer (CT) rate
coefficients for low-charge Ge, Se, Br, Kr, Rb, and Xe ions reacting with
neutral hydrogen over the temperature range 10^2--10^6 K. Each of these
elements has been detected in ionized astrophysical nebulae, particularly
planetary nebulae. CT rate coefficients are a key ingredient for the ionization
equilibrium solutions needed to determine total elemental abundances from those
of the observed ions. A multi-channel Landau Zener approach was used to compute
rate coefficients for projectile ions with charges q=2-5, and for
singly-charged ions the Demkov approximation was utilized. Our results for
five-times ionized species are lower limits, due to the incompleteness of level
energies in the NIST database. In addition, we computed rate coefficients for
charge transfer ionization reactions between the neutral species of the above
six elements and ionized hydrogen. The resulting total and state-resolved CT
rate coefficients are tabulated and available at the CDS. In tandem with our
concurrent investigations of other important atomic processes in photoionized
nebulae, this work will enable robust investigations of neutron-capture element
abundances and nucleosynthesis via nebular spectroscopy.
