Ion-molecule reactions involving HCO${}^{+}$ and N${}_2$H${}^{+}$: Isotopologue equilibria from new theoretical calculations and consequences for interstellar isotope fractionation

Mirjana Mladenović, Evelyne Roueff

$Aims$: We revisit with new augmented accuracy the theoretical dynamics of basic isotope exchange reactions involved in the ${}^{12}$C/${}^{13}$C, ${}^{16}$O/${}^{18}$O, and ${}^{14}$N/$^{15…