Dear all,
I wish to ask a somewhat novice question: What does the acronym FEFF stand for?
Thank you.
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On 5/10/2011 2:49 PM, Francisco Garcia wrote:
Dear all,
I wish to ask a somewhat novice question: What does the acronym FEFF stand for?
Thank you.
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Right, Chris.
There is a factor in the EXAFS equation, f(k). In different parts of
the literature, f(k) sometimes has different meanings, but within the
context of FEFF it refers to the effect of the potential of the
scattering atom on both the scattering amplitude (the real part) and
pha
On Tuesday, May 10, 2011 03:03:23 pm Scott Calvin wrote:
> My understanding, although I could be wrong is that the "effective"
> part came from an improvement of the theory to account for curved-wave
> effects. In other words, early theories approximated the photoelectron
> as a plane wave, b
] What does FEFF stand for?
On Tuesday, May 10, 2011 03:03:23 pm Scott Calvin wrote:
> My understanding, although I could be wrong is that the "effective"
> part came from an improvement of the theory to account for curved-wave
> effects. In other words, early theori
I think Scott is right that the original meaning of "effective" was
that the scattering amplitude is not for point scattering of a plane
wave, as was used in earlier work (say, Sayers, et al 1971). Feff3
(circa 1990) didn't to do multiple scattering, but did put in curved
wave effects.
http://
I looked into this a bit further, Bruce, and I'd tentatively say the
curved-wave corrections do turn out to be the source of the "eff":
The earliest use of f_eff I can find is from a 1986 Phys. Rev. B
article entitled "Spherical-wave effects in photoelectron
diffraction," by Sagurton et al.
Everyone is at least partially right. In our PR B34,4350(86) paper
(which was rejected by PRL) we noted that the exact single scattering
XAFS eq. could be recast in the same form as that of Sayers Stern &
Lytle (PRL 27,1204(71) by replacing the backscattering amplitude
f(pi) with the exact cur
