[Ifeffit] about the k-range choice

[Ritimukta Sarangi]

Hi Shaofeng,
Is there a reason not to use the highest k data? (You have really good data past k=14?). In general you should use as high of a k range as available unless the data are bad, compromised at high k and/or you want to compare to data of a certain k range. As you know, the shape of FT will look different as you increase k range for the transform. I suspect though that you would arrive at the same fit ( in this case) if you choose 12.4 or 13.4 data. 
Best Wishes,
Riti

Sent from my iPhone

> On Apr 28, 2020, at 7:56 AM, Shaofeng Wang <wangshaofeng at iae.ac.cn> wrote:
> 
> 
> Dear all,
> I have a question about the k-range choice. I have a set of As K-edge XAS spectrum and the k space is shown in following figure
> .
> <62CD6A1C65DE4791A677B8B96C5B567D.png>
> When I choose k-range=4-12.4 A-1, the shape of R space is like
> <284C723090C7429A9A9240868B20C63C.png>
> When I chose k-range=4-13.4 A-1, the R-space is like
> <2530E8F00B5E4A169C79D3230E58A885.png>
> The shape of second shell at approximately 2.8 A is obviously different. So, my question is how to correctly choose k range?
>  
> 
> 祝
> 好运！
> Best regards,
> 
> 王少锋，Shaofeng Wang, Ph.D
> 中国科学院沈阳应用生态研究所，Institute of Applied Ecology, CAS
> Email: wangshaofeng at iae.ac.cn; sf.wang at hotmail.com
> Address: Wenhua Road 72, Shenyang
> 
>  
> 发件人: George Sterbinsky
> 发送时间: 2020年4月14日 0:05
> 收件人: XAFS Analysis using Ifeffit
> 主题: [Ifeffit] Artemis crash upon empirical standard import.
>  
> Hello,
>  
> I am trying to import an empirical standard (.es file created in Athena) into Artemis. Upon import, Artemis crashes. This occurs with both the latest mac and windows releases (0.9.25 on mac and 0.9.26 on windows). I have attached an Athena project file containing the data used to generate the .es file (Co1-13C-std) and the data to be fit (Co1-57C-toFit). I have also attached the .es file. Following the instructions at https://bruceravel.github.io/demeter/documents/Artemis/extended/empirical.html, I import Co1-57C-toFit into Artemis and the choose "import an empirical standard" in the data window. When I choose the .es file from the file selection dialog, Artemis crashes.
>  
> Thank you,
> George
>  
> <62CD6A1C65DE4791A677B8B96C5B567D.png>
> <284C723090C7429A9A9240868B20C63C.png>
> <2530E8F00B5E4A169C79D3230E58A885.png>
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