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<div class="moz-cite-prefix">Hi Mohamed,<br>
<br>
On 7/28/2015 3:02 AM, Ivanov wrote:<br>
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<div style="color: black;">I suggest you collect a dataset
at 7kev (around 2.0A) which is the absorption edge of S. </div>
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The absorption edge of sulfur is at 2.472 keV, which is 5.0155 A...<br>
<br>
I suggest you ask the beamline scientist, which wavelength is
suitable. Maybe the beamline can be tuned to 2.5 A, but the flux
might become weak. Furthermore, absorption of X-rays in air (and the
sample) is strong for wavelengths above 2.0 A. <br>
<br>
If kappa goniometer is available, I would use it. You can also
collect data from several crystals, or several data sets at
different spots from one crystal.<br>
I think it is difficult to give recommendations about the
multiplicity you need. Collect data, then process and try to find
the substructure during your beamtime. If you cannot find the
substructure and solve the structure, collect more data and combine
data sets. <br>
<br>
Hope that helps,<br>
<br>
Dorothee<br>
<br>
<br>
<br>
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<p style="color: black; font-size: 10pt; font-family: Arial,
sans-serif; margin: 10pt 0;">On
27 July 2015 7:17:18 pm mohamed noor
<a class="moz-txt-link-rfc2396E" href="mailto:mohamed.noor34@gmail.com"><mohamed.noor34@gmail.com></a>
wrote:</p>
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<div>Dear all<br>
<br>
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Would you have some tips on
collecting datasets for S-SAD at a 'normal' beamline
(tunable from
0.5-2.5 A)? How helpful/important is it to use mini
kappa?<br>
<br>
</div>
Thanks.<br>
</div>
<a moz-do-not-send="true" class="aqm-autolink aqm-autowrap"
href="mailto:phenixbb-leave%40phenix-online.org"></a>
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