It has been suggested that high-density amorphous (HDA) ice is a structurally arrested form of high-density liquid (HDL) water, while low-density amorphous (LDA) ice is a structurally arrested form of low-density liquid (LDL) water. Recent experiments and simulations have been interpreted to support the possibility of a second "distinct" high-density structural state, named very high-density amorphous (VHDA) ice, questioning the LDL-HDL hypothesis. We test this interpretation using extensive computer simulations, and find that VHDA is a more stable form of HDA and that in fact VHDA should be considered as the amorphous ice of the quenched HDL.
@article{arxiv.cond-mat/0403365,
title = {Relation between the High Density Phase and the Very-High Density Phase of Amorphous Solid Water},
author = {Nicolas Giovambattista and H. Eugene Stanley and Francesco Sciortino},
journal= {arXiv preprint arXiv:cond-mat/0403365},
year = {2009}
}