Re: [Ifeffit] Odd feff result

At 08:59 PM 3/24/2006, Bruce wrote:

I am inclined to side with Jeremy and Feng. One might be surprised by how quick-n-dirty the amplitude calculation is. If memory serves (and who knows how likely *that* is), feff computes the complex chi(k) using plane waves, which is a very quick calculation. It then adds up the magnitude of the complex chi(k) at 4 points. That's it.

Interesting. I knew that it was quick-and-dirty, which is why I was all the more surprised that it didn't just scale with Z somehow. But if it's looking at 4 points out of the chi(k) it could easily sample in such a way as to favor the lower-Z element, as Jeremy and Feng suggested. Thanks, all! --Scott Calvin Sarah Lawrence College