Light particle scattering diffraction from surfaces in the sudden approximation Original Research Article

The sudden approximation can be the foundation of a code for performing inexpensive calculations on light particle scattering from huge surface systems. The paper describes the mathematical framework and a sample code which can be used to perform sudden calculations either in the semiclassical approximation or in an exact numerical approach. Also a straightforward extension to the treatment of inelastic collisions in a discrete set of excited states is derived and implemented.