| Elastic Scattering |
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ELECTRON ELASTIC SCATTERING When an electron is an incident particle and it is diffracted in the Coulomb potential of atoms and molecules, the elastic scattering process is called Rutherford scattering. In many electron diffraction techniques like reflection high energy electron diffraction ( RHEED ), transmission electron diffraction (TED), and gas electron diffraction (GED), where the incident electrons have sufficiently high energy (>10 keV), the elastic electron scattering becomes the main component of the scattering process and the scattering intensity is expressed as a function of the momentum transfer defined as the difference between the momentum vector of the incident electron and that of the scattered electron. This implies that elastic scattering is not necessarily a physical phenomenon, but a name attached to the way in which certain physical processes are modelled mathematically. OPTICAL ELASTIC SCATTERING When a photon penetrates into a medium composed of atoms and molecules whose sizes are much smaller than the Wavelength of the incident photon, the scattering process becomes elastic scattering and is called Rayleigh Scattering . In this scattering process, the energy (and therefore the wavelength) of the incident photon is conserved and only its direction is changed. In this case, the scattering intensity is proportional to the fourth power of the reciprocal wavelength of the incident photon. |
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