Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 87: Metal Substrates: Structure, Epitaxy and Growth
O 87.9: Vortrag
Donnerstag, 23. März 2017, 12:45–13:00, WIL C307
Electron energy loss spectroscopy with parallel readout of energy and momentum — •F. C. Bocquet1,2, H. Ibach3, J. Sforzini1, 2, S. Soubatch1, 2, and F. S. Tautz1, 2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology — 3Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Germany
Electron Energy Loss Spectroscopy (EELS) has been a very successful technique for the past three decades for studying elementary excitations at surfaces (e.g. vibrational modes, phonons, plasmons) and providing sub-meV resolution [1]. In this work, we demonstrate that the combined use of a hemispherical electron analyzers equipped with a multichannel plate (MCP) as detector, together with a modified version of the conventional double monochromator allows a faster detection of electron in the off-specular geometry. We show the first results obtained on the phonon dispersion of clean Cu(111) [2]. The full dispersion curve has been obtained in a single 7-minutes long measurement, which is a clear improvement with respect to standard spectrometer that would require several hours of acquisition.
References [1] H. Ibach, J. Elec. Spec. Relat. Phenom. 64 819 (1993) [2] H. Ibach, et al. submitted (arXiv:1611.09709)