“…Reactions of an Rg atom with hydrogen molecular ion, H , are possibly among the most commonly studied processes of this kind due to their relevance in the early universe chemistry [ 3 , 13 ]. The dynamics of Rg + H RgH + H have been investigated in a series of works along the years [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Theoretical calculations are usually restricted to the ground electronic potential energy surface (PES) which exhibits a minimum along the reaction path.…”