Sorry to pipe in on this, but I believe that Jmol inherently wants/needs to represent the atoms in cartesian coordinate space, as opposed to fractional space where the coordinate axes are not even necessary required to be orthogonal. From a visualization standpoint they would have to be converted into regular cartesians. This does not mean that it could not internally still retain the fractional coordinates that gave rise to the cartesians.

About disorder. It all has to do when comparing one unit-cell to another. I believe that there are several types of disorder:
1) a fragment in the molecule in a different location (e.g. rotated), e.g., a floppy end of a molecule.
2) the complete absence of a particular species (usually co-crystallized solvents)
3) the complete relocation of a species (solvents of counter ions)
when one averages out the occupancy of that particular location in space, an atom may have a probability of less than 1 to be found there.
Crystallography basically determines the probability to find electrons (and their associated nuclei, i.e., therefor atoms, but indirectly so) at a particular location in a unit-cell. (I am afraid I did not keep that under 25 words, though)l.


Ren�


On Oct 14, 2004, at 6:47 PM, Peter Murray-Rust wrote:


Q: Does anyone know any reason why we should not leave the coordinates
alone ... as in the file?

No



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