Here we have \(r_0^{ }\) as the classical electron radius. We know that the accuracy of this formula is limited and that the Klein-Nishina differential cross section may be more useful in many cases. However, Thomson scattering still has its uses. Even in modern times, researchers using low energy photon collisions will often utilize the properties of Thomson scattering \cite{Umstadter_2000}.
    In 1929, two physicists by the names of Oskar Klein and Yoshino Nishina were able to take the principles of scattering and apply it to what we now know as a quantum electrodynamic system \cite{Klein_1929}. They had adjusted scattering to include the quantum effects of high energy particles.