Photoelectric absorption occurs when a photon is completely absorbed in an atomic collision, transferring all its energy to an atomic electron. This process occurs when a photon is completely absorbed by a core electron, resulting in the emission of a free electron. Photons are emitted as electrons move from higher to lower energy levels, with the energy of the photon being the exact energy lost by the electron. There is an infinitesimal time delay between the colliding photon and the scattering photon to change direction of travel.
- ΔE = hΔf; where, h is Planck's constant.
Δf = 1/Δt; (Fourier transform);
Δt = h / ΔE
