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We report the dispersion coefficients for the interacting inert gas atomswith the alkali ions, alkaline earth ions and alkali atoms with their singlycharged ions. We use our relativistic coupled-cluster method to determinedynamic dipole and quadrupole polarizabilities of the alkali atoms and singlyionized alkaline earth atoms, whereas a relativistic random phase approximationapproach has been adopted to evaluate these quantities for the closed-shellconfigured inert gas atoms and the singly and doubly ionized alkali andalkaline earth atoms, respectively. Accuracies of these results are adjudgedfrom the comparison of their static polarizability values with their respectiveexperimental results. These polarizabilities are further compared with theother theoretical results. Reason for the improvement in the accuracies of ourestimated dispersion coefficients than the data listed in [At. Data and Nucl.Data Tables 101, 58 (2015)] are discussed. Results for some of the atom-ioninteracting systems were not available earlier, these results and the otherreported improved results will be very useful for the comprehensiveunderstanding of the collisional physics involving these atom-atom and atom-ioninteractions in the cold atom and atom-ion hybrid trapping experiments at thelow-temperature regime.

Dispersion coefficients for the interaction of inert gas atoms with alkali and alkaline earth ions and alkali atoms with their singly ionized ions