| 1 |
chrisfen |
1845 |
\begin{figure*} |
| 2 |
|
|
|
| 3 |
|
|
\includegraphics[width=4in]{iCrystal.eps} |
| 4 |
|
|
\caption{(A) Unit cell for Ice-{\it i}, (B) Ice-{\it i}$^\prime$, |
| 5 |
|
|
and (C) a rendering of a proton ordered crystal of Ice-{\it i} looking |
| 6 |
|
|
down the (001) crystal face. In the unit cells, the spheres represent |
| 7 |
|
|
the center-of-mass locations of the water molecules. The $a$ to $c$ |
| 8 |
|
|
ratios for Ice-{\it i} and Ice-{\it i}$^\prime$ are given by |
| 9 |
|
|
$a:2.1214c$ and $a:1.785c$ respectively. The presence of large |
| 10 |
|
|
octagonal pores in both crystal forms lead to a polymorph that is less |
| 11 |
|
|
dense than ice $I_h$.} |
| 12 |
|
|
\label{iCrystal} |
| 13 |
|
|
\end{figure*} |
| 14 |
|
|
\efloatseparator |
| 15 |
|
|
|
| 16 |
|
|
\begin{figure*} |
| 17 |
|
|
|
| 18 |
|
|
\includegraphics[width=\linewidth]{tp3PhaseDia.eps} |
| 19 |
|
|
\caption{Phase diagram for the TIP3P water model in the low pressure |
| 20 |
|
|
regime. The displayed $T_m$ and $T_b$ values are good predictions of |
| 21 |
|
|
the experimental values; however, the solid phases shown are not the |
| 22 |
|
|
experimentally observed forms. Both cubic and hexagonal ice $I$ are |
| 23 |
|
|
higher in energy and don't appear in the phase diagram.} |
| 24 |
|
|
\label{tp3PhaseDia} |
| 25 |
|
|
\end{figure*} |
| 26 |
|
|
\efloatseparator |
| 27 |
|
|
|
| 28 |
|
|
\begin{figure*} |
| 29 |
|
|
|
| 30 |
|
|
\includegraphics[width=\linewidth]{cutoffChange.eps} |
| 31 |
|
|
\caption{Free energy as a function of cutoff radius for SSD/E, TIP3P, |
| 32 |
|
|
SPC/E, SSD/RF with a reaction field, and the TIP3P and SPC/E models |
| 33 |
|
|
with an added Ewald correction term. Error for the larger cutoff |
| 34 |
|
|
points is equivalent to that observed at 9.0\AA\ (see Table |
| 35 |
|
|
\ref{freeEnergy}). Data for ice I$_c$ with TIP3P using both 12 and |
| 36 |
|
|
13.5 \AA\ cutoffs were omitted because the crystal was prone to |
| 37 |
|
|
distortion and melting at 200 K. Ice-{\it i}$^\prime$ is the form of |
| 38 |
|
|
Ice-{\it i} used in the SPC/E simulations.} |
| 39 |
|
|
\label{incCutoff} |
| 40 |
|
|
\end{figure*} |
| 41 |
|
|
\efloatseparator |
| 42 |
|
|
|