Chaos in coplanar classical collisions with particles interacting   through $1/r^2$ forces
  The scattering among three particles interacting through $1/r^2$ forces, with opposite charges and widely different masses, is studied in a coplanar geometry. The present work shows that at low impact velocities the output of the collision presents typical fingerprints of chaos. The details of the process are investigated. 
F. Sattin and L. Salasnich