Interactive HTML App

Electron Diffraction Rocking Curves

Compare kinematical and two-beam dynamical rocking curves as a function of the excitation error s, with the internal coordinate w = ξs evaluated using a variable extinction distance, and interactive control over crystal thickness, excitation-error range, extinction distance, dimensionless absorption strength α = ξ/ξ', and an optional thickness-accumulated damping length Λ_abs.

Crystal thickness t (nm)

100

Extinction distance ξ (nm)

200

Absorption strength α = ξ/ξ' (dimensionless)

Derived ξ' = 200 nm; ξ'/ξ = 1

Thickness-damping length Λ_abs (nm, log scale)

∞

Current base-thickness factor exp(-t/Λ_abs) = 1

Excitation error range |s|max (Å^-1)

±0.01

Visible models

Kinematical Two-beam dynamical

Thickness overlays

Overlay several t values

Extra t values (nm, comma-separated)

Intensity offset per thickness (x max peak)

0.25x

Physical note. The horizontal axis is plotted directly in s, while the formulas use w = ξs internally. Absorption is controlled by the dimensionless strength α = ξ/ξ', so γ_phys = (1/ξ)(1 + iα) and the normalized internal variable is γ̃ = ξγ_phys = 1 + iα. The special case α = 0 means no absorption and therefore ξ' = ∞. An additional phenomenological thickness-damping length Λ_abs may be applied through the multiplicative factor exp(-t/Λ_abs), which attenuates both curves without changing their w-dependent shape. Increasing crystal thickness t produces more closely spaced thickness fringes and narrows the central feature around the Bragg condition.

Electron Diffraction Rocking Curves

Rocking-Curve Comparison