Dear Phil,
Is the twin fraction varying? Can you correlate the variation of twin fraction
with variations in crystal morphology or handling?
With constant perfect twinning you could try MIR using the phase determination
method of Yates & Rees (Acta Cryst. (1987). A43, 30-36). I can't access the
Dear Phil,
I wouldn't be very optimistic about this. I recently tried to solve a
50:50 twin structure with simulated data (prepared with the help of a
program and data by James Holton), and failed. When I reduced the
twinning fraction at some point the structure solution worked out well
(as e
We're trying to solve a 50% twin crystal by experimental phasing (SAD & SIRAS)
since molecular replacement hasn't worked. The crystals diffract very well in
apparent space group P62 2 2. A Hg derivative shows a strong apparent anomalous
signal (from half-dataset correlations etc), but we've fail
