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We consider collisional studies of linear polyatomic ions immersed inultracold atomic gases and investigate the intermolecular interactions andchemical reactions of several molecular anions ($\mathrm{OH}^-$,$\mathrm{CN}^-$, $\mathrm{NCO}^-$, $\mathrm{C}_2\mathrm{H}^-$,$\mathrm{C}_4\mathrm{H}^-$) with alkali-metal (Li, Na, K, Rb, Cs) andalkaline-earth-metal (Mg, Ca, Sr, Ba) atoms. State-of-the-art ab initiotechniques are applied to compute the potential energy surfaces (PESs) forthese systems. The coupled cluster method restricted to single, double, andnoniterative triple excitations, CCSD(T), is employed and the scalarrelativistic effects in heavier metal atoms are modeled within the small-coreenergy-consistent pseudopotentials. The leading long-range isotropic andanisotropic induction and dispersion interaction coefficients are obtainedwithin the perturbation theory. The PESs are characterized in detail and theiruniversal similarities typical for systems dominated by the inductioninteraction are discussed. The two-dimensional PESs are provided for selectedsystems and can be employed in scattering calculations. The possible channelsof chemical reactions and their control are analyzed based on the energetics ofreactants. The present study of the electronic structure is the first steptowards the evaluation of prospects for sympathetic cooling and controlledchemistry of linear polyatomic ions with ultracold atoms.

Cold interactions and chemical reactions of linear polyatomic anions with alkali-metal and alkaline-earth-metal atoms