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

[Yushan Wang]

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
> >>>
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