The Compton wavelength is the scale below which quantum field theory effects dominate: confining a particle to a region smaller than its Compton wavelength requires enough energy to create a particle-antiparticle pair.
This wavelength is 1.0000 times the electron Compton wavelength (2.42631 pm).
The reduced Compton wavelength (lambda-bar = lambda / 2pi) appears directly in the Dirac equation and sets the natural length unit for relativistic quantum mechanics.
Next stepSwitch to scattering mode to see how a photon interacts with this particle and calculate the Compton shift.