  Attosecond physics provides unique insights into light-matter interaction on
ultrafast time scales. Its core phenomenon, High Harmonic Generation (HHG), is
often described by a classical recollision model, the simple-man or three-step
model, where the atomic potential is disregarded. Many features are already
well explained using this model; however, the simplicity of the model does not
allow the possibility of classical chaotic motion. We show that beyond this
model, classical chaotic motion does exist albeit on timescales that are
generally longer than the first recollision time. Chaos is analyzed using tools
from the theory of dynamical systems, such as Lyapunov exponents and
stroboscopic maps. The calculations are done for a one-dimensional Coulomb
potential subjected to a linearly polarized electric field.
