Abstract
We use molecular dynamics simulations to probe the rotational dynamics
of the SPC/E model of water for a range of temperatures down to $200$~K,
$6$~K above the mode coupling temperature. We find that rotational
dynamics is spatially heterogeneous, i.e., there are clusters of
molecules that rotate significantly more than the average for a given
time interval, and we study the size and the temporal behavior of these
clusters. We find that the position of a rotational heterogeneity is
strongly correlated with the position of a translational heterogeneity,
and that the fraction of molecules belonging to both kinds of
heterogeneities increases with decreasing temperature. We further find
that although the two types of heterogeneities are not identical, they
are related to the same physical picture.
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