Collision of Xray photons

In the scattering of X-rays from an atomic nucleus, we may treat the impact as the collision of a photon with a very large object. Practically no energy is lost by the photon although it will generally change direction, and lateral momentum transfer will take place. No matter how large the scattering angle, the energy hf remains almost exactly the same, i.e. the frequency and therefore the wavelength of the emergent photon are the same as before.

In the case of a collision with a free electron, the mass of the target is much smaller. The dynamics of the collision can be compared with the classical collision of two snooker balls:

0 0

Post a comment