Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 38: Atomic clusters (with MO)
A 38.2: Vortrag
Donnerstag, 20. März 2014, 11:00–11:15, BEBEL E44/46
Detecting interatomic Coulombic decay in neon clusters by photon measurement — •Andreas Hans1, A. Knie1, M. Förstel2, P. Schmidt1, P. Reiß1, T. Jahnke3, R. Dörner3, A. I. Kuleff4, L. S. Cederbaum4, P. V. Demekhin1, U. Hergenhahn2, and A. Ehresmann1 — 1Institut f. Physik, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel — 2Max-Planck-Institut f. Plasmaphysik, c/o HZB-Bessy II, Albert-Einstein Str. 15, 12489 Berlin — 3Institut f. Kernphysik, Goethe Universität, Max-von-Laue-Str. 1, 60438 Frankfurt — 4Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg
The role of interatomic Coulombic decay (ICD) in biological context is currently discussed due to anticipated genotoxic effects of low energy electrons typically produced in non-local autoionization processes. All unambiguous experimental observations of ICD so far relied on the detection of charged decay products. The further investigation of the biological relevance by this methods is constrained, since the mean free travel path of charged particles in dense media (e.g. biological samples) usually is very short. A complementary detection method for ICD, applicable to dense media, is therefore required. Here, we report the first unequivocal proof of ICD by measurements of fluorescence emission from neon clusters. In a proof of principle experiment, photon and electron emission of a supersonic neon cluster jet were measured simultaneously. Furthermore it is shown that the photon signal of clusters can easily be discriminated from the monomer's signal by its characteristic resonant excitation energies and lifetime measurements.