  We present a theory of time-resolved photoionisation in the presence of a
vortex beam. In a pump-probe setup, an extreme ultraviolet or an x-ray pump
pulse triggers ionization, which is probed by a synchronized infrared pulse
with non-zero orbital angular momentum. We show, how this property of the probe
pulse affects the electron dynamics upon ionization, in a way that is
independent of the initial and final angular momentum states of the ionizing
system.
