Photoabsorption dynamics of doubly excited two-electron systems: Closed classical orbits

We describe how closed-orbit theory can be applied to the photoabsorption dynamics of asymmetric doubly excited atoms, and demonstrate the method using He and Yb. Closed classical orbits are found to exist and are explained in terms of electron correlation and core scattering. In He, where long range electron correlation alone influences the orbits, the results give insight into the role of electron correlation on closed classical orbits