Interactive 2D EXAFS Explorer

Click the structure panel to place the absorber, then its neighbours. Coordinates and path parameters remain editable below.

Absorber Scatterer to add

No absorber yet.

E₀ (eV) S₀² ΔE₀ (eV) Default σ² (Å²) λ (Å)

χ(k) = Σ N S₀² F(k) exp(−2σ²k′²) exp(−2R/λ) sin(2k′R + δ(k′)) / (k′R²)
k′ = √max[k² − ΔE₀/3.809982, 0]

δ(k) is the tabulated, k-dependent scattering phase. Its slope shifts an uncorrected FT peak below the geometric path distance.

Illustrative F(k) and δ(k) tables

These values are pedagogical approximations, not absorber-specific FEFF paths. Quantitative work should import FEFF amplitude and phase arrays.

k min (Å⁻¹) k max (Å⁻¹) Samples k weight Window R max (Å)

The plotted transform is |∫w(k)kʷχ(k)e^2ikRdk|/√(2π), in arbitrary units. Peaks are phase shifted from geometric R.

Local atomic structure

−5 to +5 Å · click to add · drag to move

μ(E), normalized

uncorrected R