The two-body X⋅⋅⋅H system has been succeeded in describing intermolecular interactions and molecular dynamics in processes such as ice nucleation , liquid-solid transition , evaporation , molecular motion under a certain kind of perturbation, and the lifespan of a molecule residing in a specific location . An extension suggests that the hydrogen bond should include the polarityinversion involving non-classical hydridic and dihydrogen formation, meeting the requirement of X⋅⋅⋅H attraction.