 Compton wavelength

The Compton wavelength of a particle of mass $m$ is ${\lambda }_C=h/(mc)$.

The Compton wavelength is a quantum mechanical property associated with a particle, defined as the wavelength of a photon whose energy is equivalent to the rest mass energy of that particle. It was introduced by the American physicist Arthur H. Compton in the context of his studies on the scattering of X-rays off electrons.