Thomson cross-section for elastic low-energy (ℏω ≪ m_ec²) photon-electron scattering: σ_T = (8π/3)r_e², where r_e = e²/(4πε₀ m_e c²) ≈ 2.8179·10⁻¹⁵ m is the classical electron radius (scale at which the electrostatic self-energy e²/(4πε₀…
Thomson cross-section for elastic low-energy (ℏω ≪ m_ec²) photon-electron scattering: σ_T = (8π/3)r_e², where r_e = e²/(4πε₀ m_e c²) ≈ 2.8179·10⁻¹⁵ m is the classical electron radius (scale at which the electrostatic self-energy e²/(4πε₀…