This process handles the Rayleigh scattering of photons. It is an
implementation of the PENELOPE code in which care is given to the
low energy description of electromagnetic interactions, including
atomic shell effects, etc. It is valid for incident particle
energies from a few hundred eV up to about 1 GeV.
Note: The Penelope electromagnetic processes should not be used
together with "standard" electromagnetic processes such as
G4eIonisation, or else unpredictable results may occur. The one
exception to this rule is that the standard process
G4MultipleScattering may always be used.