[Ifeffit] [Ext] Re: Question about CsNO3 L3 edge

[Carlo Segre]

Hi Tien:

The transmission data is always sloping down because the absorption
coefficient, which is being measured in absolute terms by transmission,
varies as E^-3 except where there is an edge jump.  Therefore you
should see that downward slope in transmission if you have measured it
correctly.

The fluorescence measurement is not giving you the absolute absorption but
something which should be proportional to it.  the slope of that baseline
very much depends on the details of the sample and the detector.

Carlo

On Thu, Jul 1, 2021 at 5:59 AM Tien Neng-Chuan <tien.nengchuan at gmail.com>
wrote:

> Thank you very much
>
> Mangold, Stefan (IPS) <stefan.mangold at kit.edu> 於 2021年7月1日 下午5:05 寫道：
>
> 
> the plot from researchgate is transmission data, your data is
> fluorescence;
>
> best regards
>
> Stefan Mangold
>
> Am 01.07.2021 um 10:17 schrieb 田能全 <tien.nengchuan at gmail.com>:
>
> Hi Stefan,
> Thanks for the response. I am confusing about the two plots. Could you
> please explain more about the difference?
>
> <image.png>
> https://www.researchgate.net/publication/231097049_Cs_L-edge_EXAFS_atomic_absorption_background/figures?lo=1
>
>
>
> <image.png>
>
>
> Kind regards,
>
> N. C. Tien
>
>
>
> Mangold, Stefan (IPS) <stefan.mangold at kit.edu> 於 2021年7月1日 週四 下午3:38寫道：
>
>> normal for every element,
>>
>> the higher the energy, the larger is the penetration depth —
>>
>> regards
>>
>> Stefan Mangold
>>
>> Am 01.07.2021 um 06:13 schrieb 田能全 <tien.nengchuan at gmail.com>:
>>
>>
>> Hi everyone,
>> My colleague sent me data of liquid CsNO3 sample measured using
>> fluorescence model. According to the attached figure, I don't understand
>> why mu(E) increased with increasing energy before and after the L3 edge.
>> Does it make sense for cesium?  Thanks.
>>
>> Nengchuan
>> <image.png>
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-- 
Carlo U. Segre -- Duchossois Leadership Professor of Physics
Professor of Materials Science & Engineering
Director, Center for Synchrotron Radiation Research and Instrumentation
Illinois Institute of Technology
Voice: 312.567.3498            Fax: 312.567.3494
segre at iit.edu   http://phys.iit.edu/~segre   segre at debian.org
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