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Five physics mechanisms of interaction leading to the binding of the ${\rmH}_3^+$ molecular ion are identified. They are realized in a form ofvariational trial functions and their respective total energies are calculated.Each of them provides subsequently the most accurate approximation for theBorn-Oppenheimer (BO) ground state energy among (two-three-seven)-parametrictrial functions being correspondingly, H$_2$-molecule plus proton (twovariational parameters), H$_2^+$-ion plus H-atom (three variational parameters)and generalized Guillemin-Zener (seven variational parameters). These trialfunctions are chosen following a criterion of physical adequacy. They includethe electronic correlation in the exponential form $\sim\exp{(\gamma r_{12})}$,where $\gamma$ is a variational parameter. Superpositions of two differentmechanisms of binding are investigated and a particular one, which is ageneralized Guillemin-Zener plus H$_2$-molecule plus proton (ten variationalparameters), provides the total energy at the equilibrium of $E=-1.3432$\ a.u.The superposition of three mechanisms: generalized Guillemin-Zener plus (H$_2$-molecule plus proton) plus (H$_2^+$ -ion plus H) (fourteen parameters) leadsto the total energy which deviates from the best known BO energy to $\sim0.0004$\ a.u., {\it it reproduces two-three significant digits in exact, non-BOtotal energy}. In general, our variational energy agrees in two-three-foursignificant digits with the most accurate results available at present as wellas major expectation values.

The ground state of the ${\rm H}_3^+$ molecular ion: physics behind