Intra-molecular coupling as a mechanism for a liquid-liquid phase transition

We study a model for water with a tunable intra-molecular interaction $J_σ$, using mean field theory and off-lattice Monte Carlo simulations. For all $J_σ\geq 0$, the model displays a temperature of maximum density.For a finite intra-molecular interaction $J_σ> 0$,our calculations support the presence of a liquid-liquid phase transition with a possible liquid-liquid critical point for water, likely pre-empted by inevitable freezing. For J=0 the liquid-liquid critical point disappears at T=0.

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