Role of hydrogen bonding in the phase transformation of bulk liquid water to ice VII under shock loading*

It has been widely reported both through experimental and theoretical investigations that bulk liquid water under shock loading partially transforms into Ice VII – one of the densest forms of ice. It is also known from literature that hydrogen bonding plays the main role in conversion of random arrangement of water molecules in bulk liquid water to that of periodic crystalline arrangement of ice in the event of conventional freezing. Thereby, it can be quite anticipated that the hydrogen bond plays the main role in phase transformation of bulk liquid water to that of ice VII on shock compression. The current manuscript describes the changes in the spectra of water in the 0-1000 cm^-1 wavenumber regimes as bulk water is shock compressed to form ice VII. The molecular dynamic simulations carried out for this study also compares between different commonly used force potentials that are used to define water.