Thermodynamic stability of diatomic dications is an unusual phenomenon, which is mostly restricted to noble gas compounds. Potential energy curves are reported for the four MgX2+ diatomic dications listed in the title. Of the four, MgN2+, MgF2+ and MgNe2+ are thermodynamically stable, i.e. lie below their lowest dissociation limits, by 0.59, 0.82 and 0.48 eV, respectively. MgO2+ has the largest kinetic stability, with an effective dissociation barrier of 1.33 eV. Possible modes of formation of these dications are discussed.
Chemical Physics Letters
Department of Chemistry

Kolbuszewski, M. (Marcin), & Wright, J.S. (1994). Thermodynamically stable diatomic dications: MgN2+, MgO2+, MgF2+ and MgNe2+. Chemical Physics Letters, 218(4), 338–342. doi:10.1016/0009-2614(94)E1489-H