Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 27: Poster: Photoionization
A 27.4: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.V
Photoelectron-Auger electron coincidence experiments: the next generation — Tiberiu Arion1, Cosmin Lupulescu2, Ruslan Ovsyannikov3, Marko Förstel4, Gunnar Öhrwall5, Andreas Lindblad5, Svante Svensson6, Alex M. Bradshaw4,7, Ralph Püttner8, Wolfgang Eberhardt1,2, and •Uwe Hergenhahn4 — 1CFEL, 22607 Hamburg — 2TU Berlin, 10623 Berlin — 3Helmholtz-Zentrum Berlin, 12489 Berlin — 4Max-Planck-Institut für Plasmaphysik, 85748 Garching — 5MAX-Lab, SE-22100 Lund, Sweden — 6Uppsala University, SE-75120 Uppsala, Sweden — 7Fritz-Haber-Institut, 14195 Berlin — 8FU Berlin, 14195 Berlin
Inner shell photoionization of atoms and molecules almost always leads to sequential photo double ionization. The primary photoelectron is followed within a few fs by an Auger electron. Detecting these electrons in coincidence can greatly enhance the amount of information that can be spectroscopically retrieved. We present our latest set-up which primarily aims at coincidence electron spectroscopy with very high energy resolution. Our approach is based on a combination of a conventional hemispherical electron analyser with a novel time-of-flight electron spectrometer (ArTOF). Due to its use of an angle resolving electron lens, the ArTOF is superior over conventional, linear time-of-flight spectrometers in both collection angle and energy resolution. With this, we are able to achieve energy resolutions comparable to the vibrational energies of simple molecules in a coincidence experiment, while maintaining acceptable solid angles at the same time. Results of recent experiments on O2 and C2H2F2 will be presented.