[Ifeffit] Requesting guidance in understanding results from Athena

[Mike Massey]

It sounds to me like you are understanding things well. The short, short version is that the purpose of the rbkg parameter is to filter out the low-frequency oscillations (arising from any of numerous sources) in the spectrum, that correspond to interatomic distances that make no physical sense.

Or maybe I don't get it either ;)

Scott Calvin's book has a nice discussion of these points, I recommend it.


Kind Regards,


 Mike




> On Sep 14, 2020, at 9:18 AM, Deepak Varanasi <tirrano1 at gmail.com> wrote:
> 
> 
> Good afternoon
>  
> The problem lies with understanding the meaning behind signals occurring below the 1-angstrom mark. The location of the peaks and the physical meaning thereof are making no sense to me. Kindly provide me with your guidance in facilitating my understanding.
>  
> Yours Sincerely
> Deepak Varanasi
>  
> Sent from Mail for Windows 10
>  
> From: Anatoly Frenkel
> Sent: Sunday, September 13, 2020 12:58
> To: XAFS Analysis using Ifeffit
> Subject: Re: [Ifeffit] Requesting guidance in understanding results from Athena
>  
> Where is the conundrum? You make rbkg smaller and you see more low frequency features in EXAFS, as expected.
> Anatoly
>  
>  
>  
> On Sun, Sep 13, 2020 at 1:47 PM Deepak Varanasi <tirrano1 at gmail.com> wrote:
> Good afternoon
>  
> I hope that you are doing well and are healthy. My name is Deepak
> Varanasi and ii am an undergraduate student at Middle Tennessee State University In need of your guidance for my thesis project. I am having  trouble interpreting results for my EXAFS analysis done on Athena – specifically, the emergence of a signal in R-space, below the 1 – angstrom mark,  after suppressing it via its rbkg parameter (signified by the black arrows). I have checked my back ground reduction and normalization multiple time sand have failed to isolate the reason behind my results or maybe it is the due to the gaps in my knowledge that prohibit my understanding of the results. At the risk of sounding armature, may I request your guidance in resolving my conundrum please? I would be honored to have your council in solving, understanding and comprehending the physical and chemical implications of my results. For your convenience, I have also appended a picture of my results to illustrate my query. Kindly contact me at your earliest convenience and please stay safe and healthy.
>  
> Yours Sincerely
> Deepak Varanasi
>  
> P.S.: For your convenience, I have also appended a picture of my results to illustrate my query.
>  
> <57BA12E4C0E6403EA1E7F05BCB60610D.png>
>  
> <EA39B14C51484FAFBA570A6B7FB2E046.png>
>  
>  
> Resulting R – space graphs: -
>  
> <13111BEC5BCF46A8A8E5CDAE32782D44.png>
>  
>  
> <C7930CEA51084A03A840FC32E885015D.jpg>
>  
> <4A7FE6C9D4EC4E0F83E8B43E23D5ED48.png>
>  
> Resulting R – space graphs: -
>  
>  
> <83E495E5D37B431AB31567B6ED982716.png>
>  
>  
>  
>  
>  
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