[Ifeffit] Athena plotting multiple k-weights; confusion about "k" and "k-weight"
chusuei at umr.edu
Mon Aug 15 12:23:04 CDT 2005
I'm confused about what is meant by "k-weight" and "k" and how they are
used in the Athena plotting. As I understand it, "k" refers to the
photo-electron wavenumber, k = [2m(E-E0)]/(h/2pi)^2]^ 0.5. A "k-weight" is
the degree that chi(k) can be amplified. For instance k-weight of "2" in
the Athena program plots a k^2*chi(k) versus k. A k-weight of "3" plots a
k^3*chi(k) versus k, etc.
However, in plotting multiple "spectra" using the same data file of
different k-weighting one can see the different lineshapes for each
k-weight [for instance assigning k-weights = 1,2 and 3]. Yet, the Athena
output has the labels of "k^2*chi(k)" versus "k" even though there are
multiple k-weights used.
Is this a typo in the ordinate label where it would be more appropriately
labeled as "k^n*chi(k)" versus "k" where n = weight, or am I fundamentally
misunderstanding the relationship between "k" and "k-weight"? I'd
appreciate assistance in understanding if the latter is the case.
Thank you for your thoughts.
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