Dissociation energy of molecular hydrogen isotopologues

The nonrelativistic energy together with relativistic and quantum electrodynamic corrections for all the molecular hydrogen isotopologues (D2, T2, HD, HT, DT) were evaluated without expansion in the electron-nucleus mass ratio. The obtained results significantly improve the uncertainty of theoretical predictions, reaching a value below 1 MHz for the total dissociation energy. We observe good agreement with the experimental value for D2 and 3σ discrepancy for the HD molecule, while no experimental values for the dissociation energy of molecules involving tritium have yet been obtained