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<p>Dear Ahmad,</p>
<p><br>
</p>
<p>The short reply is: no, this is not included. Neutron guide reflectivities are calculated from fitted experimental data, not from reflectivity equations.</p>
<p><br>
</p>
<p>To implement this, you would need to come up with the full reflectivity curve, R(q), for a given surface. One of the former reflectivity samples could take as input exactly a file of this sort and use it for the purpose, but I think this is no longer a part
of the distribution.</p>
<p><br>
</p>
<p>There is also the Multilayer_Sample, which is a contributed component by Robert Dalgliesh. You could look into that and/or contact Robert. This is likely the closest we get to something that fit your needs.</p>
<p><br>
</p>
<p>best, Kim<br>
</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> mcstas-users <mcstas-users-bounces@mcstas.org> on behalf of Ahmad Alqaisi <aalqais2@asu.edu><br>
<b>Sent:</b> Sunday, November 5, 2023 9:52:02 PM<br>
<b>To:</b> mcstas-users@mcstas.org<br>
<b>Cc:</b> Snow, William Michael<br>
<b>Subject:</b> [mcstas-users] Including the complex part of the optical potential of Neutron in McStas</font>
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<div dir="ltr">Dear McStas team,
<div><br>
</div>
<div>I'm new to McStas simulations. I would like to ask about the complex part of the optical potential of Neutrons</div>
<div> U=V-i<b><i>W</i></b></div>
<div>Is it included in the reflectivity calculations for Neutron Guides? </div>
<div><br>
</div>
<div>If not, is there a way to add it to McStas? Can the complex part be added as an additional formula to McStas? for example by adding a formula like the one attached to this email</div>
<div><br>
</div>
<div>If you can provide me with a guidance on the script lines that would achieve such a goal, that would be great<br>
</div>
<div><br>
</div>
<div>Best,</div>
<div>Ahmad Alqaisi,</div>
<div>Student Researcher at </div>
<div>Indiana University Bloomington, US</div>
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