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It is shown that the molecular ion ${\rm H}^{++}_3$ does not exist in a formof the equilateral triangle. To this end, a compact variational method ispresented which is based on a linear superposition of six specially tailoredtrial functions containing non-linear parameters. Careful optimization of atotal of fifteen parameters gives consistently lower variational results forthe electronic energy than can be obtained with standard methods of quantumchemistry even with huge basis sets as large as mcc-pV7Z.

About non-existence of the molecular ion $\bf H_3^{++}$