  We report the dispersion coefficients for the interacting inert gas atoms
with the alkali ions, alkaline earth ions and alkali atoms with their singly
charged ions. We use our relativistic coupled-cluster method to determine
dynamic dipole and quadrupole polarizabilities of the alkali atoms and singly
ionized alkaline earth atoms, whereas a relativistic random phase approximation
approach has been adopted to evaluate these quantities for the closed-shell
configured inert gas atoms and the singly and doubly ionized alkali and
alkaline earth atoms, respectively. Accuracies of these results are adjudged
from the comparison of their static polarizability values with their respective
experimental results. These polarizabilities are further compared with the
other theoretical results. Reason for the improvement in the accuracies of our
estimated dispersion coefficients than the data listed in [At. Data and Nucl.
Data Tables 101, 58 (2015)] are discussed. Results for some of the atom-ion
interacting systems were not available earlier, these results and the other
reported improved results will be very useful for the comprehensive
understanding of the collisional physics involving these atom-atom and atom-ion
interactions in the cold atom and atom-ion hybrid trapping experiments at the
low-temperature regime.
