Professor Jim Williams visits the department from the University of Western Australia, Perth, to collaborate and share with us his group's varied activities in atomic, molecular, and surface physics.
Jim, a long-time friend of the department, is a renowned expert in probing the quantum properties of microscopic systems with low energy, spin-polarized electrons.
Small laboratory experiments can reveal atomic structure and explore Coulomb, electron exchange, and spin-orbit interactions of free single atoms and thin films. Explanations emerge for electron correlation effects in the phenomena of scattering processes of excitation and ionization.
Jim presented several tailor-made experiments and instruments especially designed to reveal symmetries for linear and angular momentum of one and two electrons and radiated photons. He stressed similarities with observations of free atoms and thin magnetic films and gave two examples: spin exchange in zinc and scattering from a monolayer of iron atoms.