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The present study concerns the factors affecting the structure, stability, and bonding character of the T-shaped and linear intermediates emerged from the recent investigation of the He(HeHHe+), He(NeHNe+), and He(ArHAr+) potential energy surfaces (PESs) [ASC Earth Space Chem. 6 (2022) 1924-1929]. The major role is played by the molecular electrostatic potential of the NgHNg+, which determines the topology of the PESs, the absolute and relative stability of the intermediates, and their bonding situation, as enlightened by Symmetry-Adapted Perturbation Theory, and by our recently proposed method of bonding analysis of noble-gas compounds [J. Chem. Phys. 156 (2022) 014104].
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