Variables in the EXAFS formula

 

k

The wave number in units of Å. where E is energy and is the Fermi level computed from electron gas theory at the average interstitial charge density.

The total central atom phase shift,

The effective curved-wave backscattering amplitude in the EXAFS formula for each shell.

The phase shift for each shell

The total central atom loss factor,

R

The distance to central atom for each shell

N

The mean number atoms in each shell

The mean square fluctuation in R for each shell

The mean free path in Å,

The Fermi momentum at the average interstitial charge density

p(r)

The local momentum,

The energy dependent self energy at energy, is the self energy at the Fermi energy.

The total absorption cross-section

The embedded atomic background absorption