Fermions tunneling from Reissner-Nordstrom black hole

Hawking tunneling radiation of spin -1/2 particles from the event horizon of the Reissner-Nordstrom black hole is studied. We introduce the Dirac equation of the charged particles. We further consider the gravitational interaction and back reaction of the emitted spin particles in the dynamical background space-time. The result shows that when the energy conservation and charge conservation are taken into account, the actual radiation spectrum of fermions also derivates from the thermal one and the tunneling rate is related to the change of Bekenstein-Hawking entropy.