<div dir="ltr">Thank you very much for all these details</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le sam. 16 janv. 2021 à 19:24, Gavin Abo <<a href="mailto:gsabo@crimson.ua.edu">gsabo@crimson.ua.edu</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On slide 19 of<br>
<br>
<a href="http://susi.theochem.tuwien.ac.at/events/ws2017/notes/Laskowski_optic-xas.pdf" rel="noreferrer" target="_blank">http://susi.theochem.tuwien.ac.at/events/ws2017/notes/Laskowski_optic-xas.pdf</a><br>
<br>
it has "broadening for Drude terms choose gamma for each case".<br>
<br>
The above statement may be advising to do an extensive literature survey <br>
for the specific structure under calculation.<br>
<br>
Slide 20 has 0.1 for a metal and 0.05 for semiconductor.<br>
<br>
When fitting a curve to experimental data such as in Origin [ <br>
<a href="https://my.originlab.com/forum/topic.asp?TOPIC_ID=10648" rel="noreferrer" target="_blank">https://my.originlab.com/forum/topic.asp?TOPIC_ID=10648</a> ], starting <br>
guess values may be needed in the Values column in the fit window:<br>
<br>
<a href="https://www.originlab.com/doc/Tutorials/Fitting-NLFit-Basic" rel="noreferrer" target="_blank">https://www.originlab.com/doc/Tutorials/Fitting-NLFit-Basic</a><br>
<br>
Perhaps, those slide 20 values are typically a good starting guess value.<br>
<br>
You might see if you can find the value in a table on online. For example:<br>
<br>
See table under "Application to materials" in:<br>
<br>
<a href="https://www.horiba.com/fileadmin/uploads/Scientific/Downloads/OpticalSchool_CN/TN/ellipsometer/Drude_Dispersion_Model.pdf" rel="noreferrer" target="_blank">https://www.horiba.com/fileadmin/uploads/Scientific/Downloads/OpticalSchool_CN/TN/ellipsometer/Drude_Dispersion_Model.pdf</a><br>
<br>
See Table 4 in article titled "Conductive nitrides: Growth principles, <br>
optical and electronic properties, and their perspectives in photonics <br>
and plasmonics":<br>
<br>
<a href="https://doi.org/10.1016/j.mser.2017.11.001" rel="noreferrer" target="_blank">https://doi.org/10.1016/j.mser.2017.11.001</a><br>
<br>
See Table 1 and others in article titled "Fitting the optical constants <br>
of gold, silver, chromium, titanium, and aluminum in the visible bandwidth":<br>
<br>
<a href="https://doi.org/10.1117/1.JNP.8.083097" rel="noreferrer" target="_blank">https://doi.org/10.1117/1.JNP.8.083097</a><br>
<br>
On 1/15/2021 6:26 PM, karima Physique wrote:<br>
> Dear WIEN2k users,<br>
> for intraband contribution, where can I find the value of Gamma for <br>
> Drude term<br>
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</blockquote></div>