Berlin 2008 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 18: Poster: Towards Molecular Spintronics, Organic Thin Films, Optical Layers, Vibrational Spectroscopy, Tayloring organic interfaces

DS 18.1: Poster

Dienstag, 26. Februar 2008, 14:30–19:30, Poster A

Stability and spin coherence of hydrogen atoms trapped in pure silica zeolite — •Rolf Simon Schoenfeld¹, Wolfgang Harneit¹, and Corma Avelino² — ¹Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany — ²Instituto de Tecnología Química UPV-CSIC, Universidad Politécnica de Valencia, Avenida de los Naranjos s/n, 46022 Valencia, Spain

We report the first observation of electron paramagnetic resonance (EPR) of hydrogen atoms trapped in pure silica LTA zeolite after gamma irradiation of n-hexane filled samples. Heating experiments revealed stability up to 80 °C in both air containing and evacuated samples. The small isotropic line width and the low deviation of hyperfine coupling constant and g-factor from the free atom values indicate a minimal distortion of the electron wave function. In addition, spin lattice and spin spin relaxation times T1 and T2 were measured by means of FT EPR. Although relaxation by spin diffusion cannot be excluded, a long spin coherence time of more than 12 microseconds was observed at ambient temperature in an evacuated sample.