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Physics and Astronomy

Physics & Astronomy Colloquium

3:30 PM, Friday, April 10th, 2015
Room 155, Chem-Phys Building

Dr. Bruno deHarak
Illinois Weslayan University


Some photons, an electron, and an atom

Laser-assisted electron-atom scattering (LAES) experiments try to answer a simple question: what happens when an electron scatters from a target in the presence of a laser field? Laser-assisted free-free (LAFF) processes are the simplest, and were the first experimentally examined, examples of LAES experiments. In LAFF experiments, the presence of a laser field reduces the amplitude of the elastic peak, and produces a series of sidebands. The sidebands below the elastic peak are the result of photon emission by the scattered electron, while the higher energy sidebands result from photon absorption. Despite the fact that LAFF experiments have been conducted for over 35 years, they are of current experimental and theoretical interest, partly because a theoretical description of some experiments has been elusive. This talk will provide an overview of the various types of LAES experiments, and then focus on our recent LAFF experiments.

Refreshments will be served in CP 179 at 3:15 PM