Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 43: Poster Session II - MA 141/144 (Surface Spectroscopy on Kondo Systems; Frontiers of Surface Sensitive Electron Microscopy; Methods: Scanning Probe Techniques+Electronic Structure Theory+Other; Time-Resolved Spectroscopy of Surface Dynamics with EUV and XUV Radiation; joined by SYNF posters)
O 43.3: Poster
Dienstag, 26. Februar 2008, 18:30–19:30, Poster F
Evidence for quantum confinement in lognormal size distributed nanodiamonds — •Thomas Berg1, Edit Marosits2, Jochen Maul1, Peter Nagel3, Ulrich Ott2, Florian Schertz1, Stefan Schuppler3, Christa Sudek2, and Gerd Schönhense1 — 1Institut für Physik, Staudingerweg 7, D-55128 Mainz, Germany — 2Max-Planck-Institut für Chemie, Becherweg 27, D-55128 Mainz, Germany — 3Forschungszentrum Karlsruhe, IFP, 76021 Karlsruhe, Germany
Quantum confinement (QC) in semiconductor nanoparticles was discovered more than two decades ago and received increasing interest during the recent years. In the case of nanodiamonds evidence for QC was reported by [1], but the discussion on the extend of these effects in nanosized diamonds is still ongoing [2,3,4].
We report on NEXAFS-PEEM measurements of the Carbon K-edge of meteoritic nanodiamonds. The NEXAFS spectrum of this nanodiamond population shows a broadened and asymmetric exciton which was assigned to the particles size distribution in recent publications but a detailed explanation is still missing. We present quantitative analysis of the modified peak shape in respect to energy shifts of the exciton and the onset of the carbon K-edge caused by the well known size distribution of this nanodiamond population as a consequence of QC. This project is supported by DFG (SCHO 341/10-1).
[1] Chang et al., Phys. Rev. Lett. 82, 5377 (1999) [2] Lley et al., Phys. Rev. Lett. 84, 5679 (2000) [3] Pong et al., Phys. Rev. Lett. 84, 5680 (2000) [4] Willey et al., Phys. Rev. Lett. 95, 113401 (2005)