It is true that in many cases oxidation/reduction affects the low k-range behavior in chi(k), but if the second shell (metal-metal) frequency is not affected, the data can still be aligned by focusing at the high k-portion of the data, so what Shelly suggested, may be, in principle, done.
Anatoly -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Scott Calvin Sent: Wednesday, February 14, 2007 10:55 AM To: XAFS Analysis using Ifeffit Subject: Re: [Ifeffit] question about Eo and simultaneous fitting Hi Shelly, Interesting--I've never tried that method with samples that I expect to differ in oxidation state. If it's differing in oxidation state, the local environment is probably different too...particularly, nearest-neighbor distances should be changed significantly. So how do you align the chi(k) data with each other, when they oscillate at a different frequency? --Scott Calvin Sarah Lawrence College At 10:38 AM 2/14/2007, you wrote: >The approach that I like to take, is to vary the choice of E0 in the >background subtraction step so that the chi(k) spectra are well aligned >with each other and the theory. Then only one Ezero parameter is >needed. > >Cheers, >Shelly _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
