Re: [Ifeffit] Coordination number

2006-11-23 Thread Juan Antonio Maciá Agulló
It is polemic in terms of use coordination numbers or SO2, both are connected. In fact, you calculate SO2 in Artemis but I do not how to obtain N for my catalyst. Ok, thank you very much Anatoly I am reading your papers. Best regards, JA begin:vcard n:Maciá Agulló;Juan Antonio tel;fax:0034-96

RE: [Ifeffit] Coordination number

2006-11-23 Thread Anatoly Frenkel
This is not quite accurate: the coordination number measured by EXAFS is the TOTAL number of closest neighbors per TOTAL number of absorbing atoms. If the sample is a single phase, these two definitions are the same. If the sample is heterogeneous, e.g., some percentage x of nanoparticles and the r

Re: [Ifeffit] Coordination number

2006-11-23 Thread Stefano Ciurli
Hi Juan, I am not sure why you say that the question is polemic. I will give you the definition that a coordination chemist would give: the coordination number is the number of closest neighbours. But maybe I do not understand the question Regards Stefano I have a simple question but I am

RE: [Ifeffit] Coordination number

2006-11-23 Thread Anatoly Frenkel
These references may be useful as the answers to both "why" and "how". http://pubweb.bnl.gov/users/frenkel/www/PTRU/ptru.pdf http://pubweb.bnl.gov/users/frenkel/www/PTRU/evolution.pdf By "average", do you mean average betwee the A-B and A-A first nearest neighbor coordination numbers? They shoul

[Ifeffit] Coordination number

2006-11-23 Thread Juan Antonio Maciá Agulló
Hi all, I have a simple question but I am afraid it is polemic. Why people always calculate coordination numbers and bond distances and how? I have an e-mail where Bruce described perfectly how to calculate the coordiantion number for the first shell. But,...if I have bimetallic catalysts or/and

Re: [Ifeffit] OS X Mactel

2006-11-23 Thread Paul Fons
I would love to hear how you did it. One of the underlying problems making even things for the powerpc complicated is the use of gcc 3 (there are linking problems with gcc 4). If you managed to hack around this in a reproducible way, it would make life easier on the powerpc side of the fe