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|
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\begin{figure} |
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\includegraphics[width=\linewidth]{unitCell.eps} |
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\caption{Unit cells for (A) Ice-{\it i} and (B) Ice-$i^\prime$, the |
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elongated variant of Ice-{\it i}. The spheres represent the |
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\caption{Unit cells for (A) Ice-{\it i} and (B) Ice-{\it i}$^\prime$, |
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the elongated variant of Ice-{\it i}. The spheres represent the |
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center-of-mass locations of the water molecules. The $a$ to $c$ |
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ratios for Ice-{\it i} and Ice-{\it i}$^\prime$ are given by |
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$a:2.1214c$ and $a:1.7850c$ respectively.} |
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from which Ice-{\it i} was crystallized (SSD/E) in addition to several |
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common water models (TIP3P, TIP4P, TIP5P, and SPC/E) and a reaction |
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field parametrized single point dipole water model (SSD/RF). It should |
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be noted that a second version of Ice-{\it i} (Ice-$i^\prime$) was |
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used in calculations involving SPC/E, TIP4P, and TIP5P. The unit cell |
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of this crystal (Fig. \ref{iceiCell}B) is similar to the Ice-{\it i} |
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unit it is extended in the direction of the (001) face and compressed |
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along the other two faces. There is typically a small unit cell |
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distortion of Ice-{\it i}$^\prime$ that converts the normally square |
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tetramer into a rhombus with alternating 85 and 95 degree angles. The |
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degree of this distortion is model dependent and significant enough to |
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split the tetramer diagonal location peak in the radial distibution |
150 |
< |
function. |
141 |
> |
be noted that a second version of Ice-{\it i} (Ice-{\it i}$^\prime$) |
142 |
> |
was used in calculations involving SPC/E, TIP4P, and TIP5P. The unit |
143 |
> |
cell of this crystal (Fig. \ref{iceiCell}B) is similar to the Ice-{\it |
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> |
i} unit it is extended in the direction of the (001) face and |
145 |
> |
compressed along the other two faces. There is typically a small unit |
146 |
> |
cell distortion of Ice-{\it i}$^\prime$ that converts the normally |
147 |
> |
square tetramer into a rhombus with alternating 85 and 95 degree |
148 |
> |
angles. The degree of this distortion is model dependent and |
149 |
> |
significant enough to split the tetramer diagonal location peak in the |
150 |
> |
radial distibution function. |
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|
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\section{Methods} |
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