Scattering amplitude
In quantum physics, the scattering amplitude is the probability amplitude of the outgoing spherical wave relative to the incoming plane wave in a stationary-state scattering process. == Formulation == Scattering in quantum mechanics begins with a physical model based on the Schrodinger wave equation for probability amplitude ψ {\displaystyle \psi } : − ℏ 2 2 μ ∇ 2 ψ + V ψ = E ψ {\displaystyle -{\frac {\hbar ^{2}}{2\mu }}\nabla ^{2}\psi +V\psi =E\psi } where μ {\displaystyle \mu } is the reduced mass of two scattering particles and E is the energy of relative motion.