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<p>Interesting question for me</p>
<p>My answer is that when you have small orbitals that do not overlap, like 4f, mixed with larger orbitals, then they do not contribute to the conductivity.<br>
</p>
<p>So optical gap is smaller than electronic gap</p>
<p>You can check wikipedia;<br>
</p>
<p><a title="Ctrl+Haga clic o pulse para seguir el vínculo" id="LPlnk61471" href="https://en.wikipedia.org/wiki/Band_gap">https://en.wikipedia.org/wiki/Band_gap</a></p>
<p>Also;</p>
<p><a id="LPlnk279061" href="https://www.researchgate.net/post/What_is_the_basic_difference_between_optical_band_gap_and_electrical_band_gap">https://www.researchgate.net/post/What_is_the_basic_difference_between_optical_band_gap_and_electrical_band_gap</a></p>
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<a target="_blank" href="https://www.researchgate.net/post/What_is_the_basic_difference_between_optical_band_gap_and_electrical_band_gap" style="text-decoration: none;" id="LPUrlAnchor_14584170717970.975922121506105">What is the basic difference between optical
band gap and ...</a></div>
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What is the basic difference between optical band gap and electrical band gap?</div>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>De:</b> wien-bounces@zeus.theochem.tuwien.ac.at <wien-bounces@zeus.theochem.tuwien.ac.at> en nombre de said chibani <chibanisaid102@gmail.com><br>
<b>Enviado:</b> sábado, 19 de marzo de 2016 04:43 a. m.<br>
<b>Para:</b> A Mailing list for WIEN2k users<br>
<b>Asunto:</b> [Wien] (no subject)</font>
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<div dir="ltr">Dear Wien Users,
<div>what is the difference between electronic gap and optical gap ? and how to determine lectronic gap from the optical properties ?</div>
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<div><span style="font-family:garamond,serif; font-size:large">Best wishes</span><br>
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