  Utilising Car-Parrinello molecular dynamics simulations, the finite
temperature behaviour of water trimers, (H2O)3, in both neutral and anionic
frameworks, has been investigated. A significant structural change in the
anionic structure has been observed at temperatures above 100 K where a chain
geometry has formed and stabilised entropically. On the other hand, neutral
trimers have remained in their ring structure, as predicted theoretically at
low temperatures, for long time periods.
