Mainz 2017 – scientific programme
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MO: Fachverband Molekülphysik
MO 19: Clusters II (with A)
MO 19.6: Talk
Friday, March 10, 2017, 12:30–12:45, N 3
Determination of average cluster sizes by fluorescence: proof of principle on Ne, Ar, and Kr clusters — •Xaver Holzapfel1, Andreas Hans1, Philipp Schmidt1, Ltaief Ben Ltaief1, Philipp Reiss1, Reinhard Dörner2, Arno Ehresmann1, and André Knie1 — 1University of Kassel, Institute of Physics and Center of Interdisciplinary Nanostructure Science and Technology (CINSaT), D-34132 Kassel, Germany — 2Institute of Nuclear Physics, J. W. Goethe University, D-60438 Frankfurt, Germany
Finite aggregates like clusters cover the range between molecular and condensed matter physics and are used to study microscopic phenomena. The most important quantity for fundamental investigations of clusters is their average size. For clusters produced by a supersonic expansion, however, the average cluster size is usually estimated by an empirical law involving the stagnation pressure of the expansion, a law whos validity is under debate since its introduction. Here we present an alternative method for determination of the mean cluster size by resonant excitation of outer valence electrons and the subsequent emission of fluorescence photons in Ne, Ar and Kr. This method has been compared to average cluster size determination by the empirical law essentially corroborating the latter and can be used in the future for independent average cluster size determination.