Dr. Francis Penent: Magnetic bottle multicoincidence spectrometry of multiple electron ionisation
Povzetek:
Magnetic bottle multicoincidence spectrometry of multiple electron ionisation
Dr. Francis Penent, LCP-MR, Universite Pierre et Marie Curie, Paris
Multiple ionisation processes play an important role in plasma physics and their investigation is motivated also by problems in fusion research and astronomy. These processes, which are in many ways affected by electron correlations in atomic or molecular systems, are most directly studied by coincidence methods. However, conventional coincidence experiments are mostly limited to the detection of two electrons only and more complicated processes where three or more electrons are ejected in a single ionisation event are more difficult to analyse. With our magnetic bottle electron spectrometer 2, 3, 4 (and up to 5) electrons have been detected in coincidence with a good energy resolution. This allows the disentanglement of multiple ionisation events as, for instance, double Auger or cascade Auger decays or, also, direct double ionisation involving core and valence shells followed by Auger relaxation. Some examples in rare gases and small molecules will be presented showing the complexity and relative contribution of such processes to the decay pathways.
