Re: [Ifeffit] Problem with Hephaestus at Ca L-edges (Matthew Marcus)

It is very hard to measure or to calculate absolute absorption data, especially in the vicinity of the absorption edges and especially in the soft x-ray region. Therefore there are significant differences between the tables and I think nobody knows which are better. Chantler, for example, says

Re: [Ifeffit] Problem with Hephaestus at Ca L-edges (Matthew Marcus)

I'm not after absolute data, just the edge-jump ratio. This would have to be extracted by peak+arctan fitting because any spectra will have peaks and a very limited range between edges. If the Chantler numbers are incorrect, then perhaps the edge-jump ratio is really 2. Do you have a

Re: [Ifeffit] Problem with Hephaestus at Ca L-edges (Matthew Marcus)

OK. Now I get it. Why use 50eV? Since lifetime and other broadening is not taken into acocunt in any of these tables, why not use a very small number? mam On 9/24/2015 11:07 AM, Bruce Ravel wrote: On 09/24/2015 01:43 PM, Matthew Marcus wrote: See the attached ppt for the demo. I

Re: [Ifeffit] Problem with Hephaestus at Ca L-edges (Matthew Marcus)

Hi Matthew, On Thu, Sep 24, 2015 at 12:47 PM, Matthew Marcus wrote: > OK, at least we've come to convergence about what 'edge jump' means in > this context. > > Do you think the Elam value for (mu(+)-mu(-))_L3/(mu(+)-mu(-))_L2 is > correct? > Well, I don't really know.

Re: [Ifeffit] Problem with Hephaestus at Ca L-edges (Matthew Marcus)

What I was after was L3/L2, so I don't care about L1. The attached plot doesn't show the jumps for both L2 and L3. When you say that the edge jumps are 5.8,1.4 and 1.1, are you referring to mu(+)/mu(-)? I was looking for (mu(+)-mu(-))_L3/(mu(+)-mu(-))_L2. What about that seeming

Re: [Ifeffit] Problems during copper (II) oxide data treatment

Pedro, I believe you can learn a lot from Bruce's video lectures, see http://www.diamond.ac.uk/Beamlines/Spectroscopy/Techniques/XAS.html The peak at 1A is due to your improper background removal. After you see Bruce's lectures, you will be one step closer to be an XAFS expert. Good luck!