Re: [Ifeffit] bond distance resolution and correlation of parameters in MS analyses?

2007-06-06 Thread Matt Newville
HI Mark, > Any thoughts and opinions would be greatly appreciated as this relates > directly to corrections suggested to be made to my PhD thesis! This is going to re-iterate most of what Bruce said, but since you asked: > 1)Does the equation for bond distance resolution (r = pi/2deltak) only a

Re: [Ifeffit] bond distance resolution and correlation of parameters in MS analyses?

2007-06-06 Thread Bruce Ravel
On Wednesday 06 June 2007, MarkBondin wrote: > 2) What is the actual equation which defines the determinacy of a fitting > procedure and does this differ between SS and MS analyses? For MS analyses > there has been a recently published equation (Coord. Chem. Rev. 2005, 249, > 141-160) which takes i

Re: [Ifeffit] help with CoCr bimetallic catalyst

2007-06-06 Thread Anatoly Frenkel
Codruta - it's better off if you have someone walk you through this type of analysis for the very first time, as it is somewhat involved. You may decide to come to one of the short courses (the nearest ones will be at the APS in the end of July, and the NSLS in October - the dates are still being f

[Ifeffit] help with CoCr bimetallic catalyst

2007-06-06 Thread codruta . zoican
I have been, working with a bimetallic Co/Cr catalyst supported on a silica template for synthesis of single wall carbon nanotubes. Recently I have performed some analysis at the NSLS. It is clear from the spectra in R space that the interatomic distances are modified compared to the monometallic c

Re: [Ifeffit] bond distance resolution and correlation of parameters in MS analyses?

2007-06-06 Thread Bruce Ravel
On Wednesday 06 June 2007, MarkBondin wrote: > 1)Does the equation for bond distance resolution (r = pi/2deltak) only > apply to SS? I have held the opinion that this can be applied to MS > analysis however I have recently been informed that this equation does not > correctly describe distance reso

[Ifeffit] bond distance resolution and correlation of parameters in MS analyses?

2007-06-06 Thread MarkBondin
Hi, I would like general opinions of some EXAFS practioners in regards to the most widely accepted methods for bond distance resolution and correlation of parameters in both single scattering (SS) and multiple scattering (MS) EXAFS refinements and if these can be said to differ? 1)Does the equa