Electron cyclotron resonance

where e {displaystyle e} is the elementary charge and m {displaystyle m} is the mass of the electron. For the commonly used microwave frequency 2.45 GHz and the bare electron charge and mass, the resonance condition is met when B = 875 G = 0.0875234740965 T. For particles of charge q, electron rest mass m0,e moving at relativistic speeds v, the formula needs to be adjusted according to the special theory of relativity to: