THE INVERSE FARADAY-EFFECT, FERMION SPIN, AND B(3)

The inverse Faraday effect is demonstrated from the Dirac equation of a fermion in a circularly polarized electromagnetic field, and is show n to be due to the Evans-Vigier field, B-(3), whose source in vacuo is the beam conjugate product. Fermion spin resonance in a microwave or radiofrequency beam is demonstrated to be highly sensitive to the inve rse Faraday effect, (IFE), which is related to photon mass through the de Broglie guidance theorem. Under well-defined experimental conditio ns, the IFE demonstrates the existence of photon mass, and provides an upper bound which is compatible with cosmological measurements.