Hannover 2010 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 18: Cluster I

MO 18.8: Vortrag

Donnerstag, 11. März 2010, 12:15–12:30, F 102

Vibrationally mediated electron detachment from anionic clusters with an IR intra-cavity free electron laser — •Marko Haertelt¹, Vivike Lapoutre², Joost Bakker², André Fielicke¹, and Gerard Meijer¹ — ¹Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — ²FOM Institute for Plasma Physics Rijnhuizen, Nieuwegein, The Netherlands

For anionic clusters photoelectron spectroscopy (PES) is up to now the most generally applied technique to probe their structure. Despite the progress in high resolution PES, e. g. via slow electron photoelectron imaging, only for a few systems vibrational resolution has been obtained. The high IR intensity provided by the new Free Electron Laser for IntraCavity Experiments, FELICE, offers the opportunity for obtaining vibrational spectra of anions via multiple photon electron detachment (MPED). For many anionic transition metal clusters the electron affinity is lower than the bond dissociation energy. Resonant excitation of an infrared active vibrational mode leads via rapid vibrational redistribution to a thermal heating of the cluster and can be followed by electron detachment rather than a fragmentation process. Recently, in a proof-of-principle experiment, we have obtained the first far IR-MPED spectra of tantalum carbide cluster anions with FELICE.