Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 5: Posters Tuesday (Photoionisation, Multi Photon Processes)
A 5.2: Poster
Dienstag, 3. April 2001, 12:30–15:00, AT3
Photoelectron Diffraction Mapping: Molecules Illuminated from Within — •Reinhard Dörner1, Allen Landers2, Thorsten Weber3, Imad Ali3, Amine Cassimi4, Mirko Hattass3, Ottmar Jagutzki3, Andreas Nauert3, Timur Osipov5, Andre Staudte3, Mike Prior6, Lew Cocke5, and Horst Schmidt-Böcking3 — 1University Freiburg, Germany — 2Western Michigan University., Kalamazoo, Mi, USA — 3University Frankfurt, Germany — 4CIRIL/CEA/CNRS/ISMR CAEN, Frannce — 5Kansas State University, Manahttan Kansas, USA — 6LBNL, Berkeley CA, USA
Much of our knowledge of the internal structure of matter results from the scattering and diffraction of electrons or X-rays. In most cases, the matter under investigation is in the solid form and can therefore be easily oriented in the laboratory. However, because much of the interesting matter found in nature is in the gas phase, it is important that we seek methods which allow the detailed exploration of randomly oriented systems. We demonstrate the use of a multiparticle coincidence technique to image the diffraction of an electron wave whose source is a specific site in a free molecule, i.e. core-level photoelectrons are used to illuminate the molecule from within. We illustrate this technique for CO, by creating a photoelectron from the C(1s) shell. A richly structured electron diffraction pattern is obtained in a body-fixed frame of the randomly oriented molecule in the gas phase.