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Stability of the bound ground states in the six five-body muonic $a b \mue_2$ ions (or $(a b \mu e_2)^{-}$) and ten six-body $a b c \mu e_2$quasi-molecules is investigated. The notations $a, b, c$ stand for the barenuclei of three hydrogen isotopes - protium ($p$), deuterium ($d$) and tritium($t$). All these systems are the Coulomb five- and six-body systems with unitcharges. It is found that the ground bound $S(L = 0)-$states are stable in allsix five-body $a b \mu e_2$ ions and in ten six-body $a b c \mu e_2$quasi-molecules. As follows from accurate variational computations of thefive-body $a b \mu e_2$ ions their internal structure is similar to theinternal structure of the negatively charged hydrogen ion H$^{-}$. Analogously,we show that the internal structures of the six-body neutral $a b c \mu e_2$quasi-molecules are similar to the structure of the two-center H$_{2}$ moleculewhich contains two heavy hydrogen nuclei and two bound electrons.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Internal clusterization in the Coulomb few-body systems and stability of the five- and six-body systems with unit charges