Scattering wavefunction (source code)

= Scattering wavefunction

For a localized target and a plane wave incident along the $z$-axis, the large-radius scattering wavefunction has the form
$$
\psi(\mathbf r)\sim e^{ikz}+f(\theta,\phi)\frac{e^{ikr}}r,
$$
where $f$ is the <scattering amplitude>.