The discussion centers on the search for isotopic measurements of diatomic molecules with a ground state of 2Σ, specifically focusing on HeH+, HeD+, and HeT+. Participants note that while there are accurate calculations available, they primarily lack direct measurements and detailed molecular parameters for the energy levels. The interest in these molecules stems from their formation during the decay of tritium isotopes, which are relevant in neutrino mass studies. There is a desire for data on larger molecules than hydrogen, as well as clarification on whether the isotopes would be singlets. The conversation emphasizes the need for empirical data to complement existing theoretical calculations.