The lack of availability of laboratory data, in particular in the case of reactive species (transition molecules, radicals, ions) which remain more difficult to study in the laboratory than their stable counterparts, is the main factor currently limiting astronomical molecular detection. In order to facilitate the detection of the chloronium isotopologues HDCl + and D 2 Cl + , in this work, we provide information on the spectroscopic properties of these isotopologues. We use the explicitly correlated F12, coupled-cluster method, CCSD(T)-F12b, approach to optimize the geometric parameters of the ion and to generate the 3D-potential energy surface. This allows the computation of vibrational energy levels of chloronium H 2 Cl + , its two isotopologues HDCl + and D 2 Cl + (with 35Cl and 37Cl chlorine isotopes), using the variational approach implemented in our home-made Fortran code. We compare our theoretical spectra with those available in the literature, experimental ones with Lee et al and theoretical ones with Botschwina . Our results show good agreements with those of the literature.