In this work, we probe anion production upon electron interaction with Fe(CO)5 clusters using two complementary cluster-beam setups. We have identified two mechanisms that lead to synthesis of complex anions with mixed Fe/CO composition. These two mechanisms are operative in distinct electron energy ranges. It is shown that the elementary decomposition mechanism that has received perhaps the most attention in recent years (i.e., dissociative electron attachment at energies close to 0 eV) becomes suppressed upon increasing aggregation of iron pentacarbonyl. We attribute this suppression to the electrostatic shielding of a long-range interaction that strongly enhances the dissociative electron attachment in isolated Fe(CO)5.

Department of Experimental Physics Faculty of Mathematics Physics and Informatics Comenius University Mlynská dolina F2 84215 Bratislava Slovakia

Institut für Ionenphysik und Angewandte Physik Leopold Franzens Universität Innsbruck Technikerstrasse 25 6020 Innsbruck Austria

J Heyrovský Institute of Physical Chemistry v v i Czech Academy of Sciences Dolejškova 3 18223 Prague 8 Czech Republic

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