Fantastic, Simon. This will go a long way to informing people. I would like
to suggest some more explicit explanation in:
*The animations reflect the relationships between the various phases that
constitute the final structure, rather than a realistic disposition of
atoms in 'time and space', i.e. the animation only serves as a
visualization of the phasing correlations in a given unit cell. *
Perhaps:
It is important to understand that the images below do not illustrate
active vibrations or phonons. Atoms in these crystals are not moving in
concert, or at least not this way. Rather, in these crystals no two unit
cells are identical. As the animation runs, you see all possible versions
of the unit cell displayed in time by passing along the "modulation axis"
which is not shown. At any given frame in the animation you may be looking
at a unit cell that is thousands of unit cells away from the previous
frame.
One way to conceptualize what you are seeing is that the unit cell is a
four-dimensional object that is being projected into 3D. The value of these
animations is that you use them to quickly see how various atoms modulate
in relation to each other --- some pairs will maintain roughly the same
distances throughout the crystal, while others will be found in different
unit cells with significantly different distances between them.
In these animations the modulation is amplified by ? times.
(I think some of those are amplified, right?)
Bob
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