[Wien] about the near edge x-ray absorption spectrum

[Vera Zhuang]

Read the physics textbook!

Yushan Wang wrote:

>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:
>
>  
>
>>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:
>>
>>    
>>
>>>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:
>>>
>>>
>>>
>>>      
>>>
>>>>Yes, under the condition he also has the X-ray emission spectrum
>>>>obtained on the ssme energy scale.
>>>>
>>>>Yushan Wang wrote:
>>>>
>>>>
>>>>
>>>>        
>>>>
>>>>>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
>>>>>
>>>>>_______________________________________________
>>>>>Wien mailing list
>>>>>Wien at zeus.theochem.tuwien.ac.at
>>>>>http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>          
>>>>>
>>>>_______________________________________________
>>>>Wien mailing list
>>>>Wien at zeus.theochem.tuwien.ac.at
>>>>http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
>>>>
>>>>
>>>>
>>>>        
>>>>
>>>_______________________________________________
>>>Wien mailing list
>>>Wien at zeus.theochem.tuwien.ac.at
>>>http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
>>>
>>>
>>>      
>>>
>
>_______________________________________________
>Wien mailing list
>Wien at zeus.theochem.tuwien.ac.at
>http://zeus.theochem.tuwien.ac.at/mailman/listinfo/wien
>  
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://zeus.theochem.tuwien.ac.at/pipermail/wien/attachments/20040730/5b75ddc4/attachment.html