Re: [Ifeffit] Ti data problem

2016-08-08 Thread Carlo Segre
Hi Jia: For the first one of the spectra, I chose the shoulder in the derivative at 4974 instead of the large peak. I consider the lower energy peak to be a pre-edge feature due to the 3d quadrupole transitions and I generally don't choose that. If the analysis later tells me that I am

Re: [Ifeffit] Ti data problem

2016-08-08 Thread Carlo Segre
of longer counting times? Siliang -Original Message- From: Carlo Segre [mailto:se...@iit.edu] Sent: Monday, August 08, 2016 4:05 PM To: Siliang Chang <schan...@uic.edu> Cc: ifeffit@millenia.cars.aps.anl.gov Subject: Re: [Ifeffit] Ti data problem Hi Siliang: The first thing is th

Re: [Ifeffit] Ti data problem

2016-08-08 Thread Qingying Jia
Hi Carlo, In many transition metal oxide cases like this, what would be the more proper E0, the position of the apex of the first derivative peak or the second one that is usually higher than the first peak, or it really depends? I have seen people using either. In this particular case, it

Re: [Ifeffit] Ti data problem

2016-08-08 Thread Siliang Chang
Chang <schan...@uic.edu> Cc: ifeffit@millenia.cars.aps.anl.gov Subject: Re: [Ifeffit] Ti data problem Hi Siliang: The first thing is that you have misidentified the edge position. Itis way too high in all the data sets. Put it at the inflection point of the main rise in the absorption

Re: [Ifeffit] Ti data problem

2016-08-08 Thread Carlo Segre
Hi Siliang: The first thing is that you have misidentified the edge position. Itis way too high in all the data sets. Put it at the inflection point of the main rise in the absorption curve and you will find that the problem is much reduced. The second thing is that you have a very bad

[Ifeffit] Ti data problem

2016-08-08 Thread Siliang Chang
Dear all, I am new to XAFS data analysis. I’m currently working on the XAFS data of atomic layer deposited mixed oxide thin film: SnTiOx. I have both Sn and Ti K edge data, and was able to fit Sn edge using a model of (Sn,Ti)O2 solid solution. However, Ti data really confuses me (please see