Re: [Ifeffit] Phase shift

Hi Julian, On Tue, Apr 10, 2018 at 1:30 PM, Julian Ehwald wrote: > Dear all, > > > > I have a very general question about the phase shift. I tried to fit a > rather noisy sample of Li2IrO3, where I get a first main peak around 1 > angstroem, according to FEFF calculation

[Ifeffit] Phase shift

Dear all, I have a very general question about the phase shift. I tried to fit a rather noisy sample of Li2IrO3, where I get a first main peak around 1 angstroem, according to FEFF calculation there should be something at 1.9 and not any closer. This phase shift seems a bit too big to be true,

Re: [Ifeffit] Sulfur EXAFS k oscillations

Actually, I have seen effects this like with the Spline Clamps turned up like you have them. What does this look like if you set Spline Clamps, both low and high, to none? Also, you should plot the full XAFS (in E, the whole thing, with the edge) and look at the background curve. My guess is

Re: [Ifeffit] Sulfur EXAFS k oscillations

Hi Beth: I suggest that you not use kw=3 as that will make these background subtraction oscillations worse. Another thing you can try is to cut down the high end of your spline range to 13, then 12.5 and see if that makes it behave a bit better. I find that it helps a lot when the data is

Re: [Ifeffit] [Ifeffit} Sulfur EXAFS k oscillations

Dear Beth, Apart from the fact it looks like there is a trace Cl impurity in one of the samples (sharp line at ca. 9.5 k), it is hard to tell how a spline is going wrong without seeing the spline, thus posting the Athena file might get a better response. It may well be there is not much data