A detailed dynamical study is presented for N2 +/He collisions running in the electronic ground state of the collision complex. Hybrid, quantum-classical dynamical calculations have been performed considering a broad range of collision energies (Ecoll=0.01-100eV) and various initial rotational-vibrational excitations of the N2 + ion. Both non-reactive and reactive (N2 + collision-induced dissociation) cross-sections have been calculated with the momentum-transfer approximation applied to the former ones. A thorough comparison with pseudo-experimental data obtained from mobility measurements reported in the literature via an inverse-method approach has been performed and the effect of the rotational alignment of the N2 + ion on calculated cross-sections has been assessed and analyzed.

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A detailed modeling of N2 + transport properties in helium gas has been performed by employing Monte Carlo calculations based on ab initio collision cross-sections reported by our group in a preceding paper. A broad range of the reduced electric field (E/N) is considered to provide data directly usable in macroscopic modeling of processes in cold helium plasmas. The N2 + mobility in helium gas at room temperature (T = 300K), the characteristic energies of its longitudinal and transversal diffusion, and the rate constant of the N2 + dissociation induced by collisions with helium atoms have been calculated. The effect of the N2 + initial rotational-vibrational excitation is investigated as well as the effect of the rotational alignment of the N2 + molecule. A direct comparison with N2 +/He mobility experimental data is performed as well as indirect tests of theoretical estimates of the characteristic diffusion energies by comparing the latter with pseudo-experimental data obtained from mobility experiments via an inverse-method approach.