Critical escape velocity for a charged particle moving around a weakly
  magnetized Schwarzschild black hole
  We discuss charged particles motion in a spacetime of a weakly magnetized
static non-rotating black hole. We study under which conditions a charged
particle originally revolving around the black hole at a circular orbit after
being kicked by another particle or photon can escape to infinity. We determine
the escape velocity for particles at the innermost stable circular orbits and
discuss the properties of particles moving with near-critical velocity. We show
that in a general case such a motion is chaotic.
