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Read the physics textbook! <br>
<br>
Yushan Wang wrote:<br>
<blockquote type="cite"
cite="midPine.SOL.4.58L.0407301340180.1962@copland.udel.edu">
<pre wrap="">hi, you quite agree with your idea, but my question is how can you get the
band gap specially between the top of the valence band and the bottom of
the conduction band by only the absorption spectrum. let me stress my
point, I do not care the valence band, neither the conduction band, but
I just want to know what is the band gap between them only by the
near edge x -ray spectrum. thanks for your reply.
yushan
On Fri, 30 Jul 2004, Vera Zhuang wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Well, think about basic physics. The energy seperation of top of the
occupied density of states and the bottom of the unoccupied density of
states is band gap. The former could be extracted from X-ray emission
and the later fron X-ray absorption. We do this all the time at
Advanced Light Source in Berkeley!
Yushan Wang wrote:
</pre>
<blockquote type="cite">
<pre wrap="">hi, the band gap mentioned above is not the x-ray emmision spectrum, but
the band between the top of the valence band and the bottom of the
conduction band. how can you get it from the near edge x-ray absorption
spectrum?
yushan
On Fri, 30 Jul 2004, Vera Zhuang wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Yes, under the condition he also has the X-ray emission spectrum
obtained on the ssme energy scale.
Yushan Wang wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Dear users,
a famous professor insists that from the near edge x-ray absorption
spectrum he can
obtain the band gap of semiconductor. do you think so?
yushan
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