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High‐frequency EPR and ENDOR spectroscopy on semiconductor nanocrystals
Author(s) -
Orlinskii S. B.,
Blok H.,
Groenen E. J. J.,
Schmidt J.,
Baranov P. G.,
de Mello Donegá C.,
Meijerink A.
Publication year - 2005
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1686
Subject(s) - chemistry , electron paramagnetic resonance , spins , spectroscopy , nanocrystal , saturation (graph theory) , semiconductor , nuclear magnetic resonance , condensed matter physics , molecular physics , nanotechnology , optoelectronics , materials science , physics , mathematics , quantum mechanics , combinatorics
EPR and ENDOR experiments at 95 GHz on ZnO nanoparticles reveal the presence of shallow donors related to interstitial Li and Na atoms. The experiments allowed, for the first time, to probe the effect of confinement on the shape of the electronic wave function. In addition, it is observed that the 67 Zn nuclear spins become polarized upon saturation of the EPR transition. This Overhauser effect is induced by the zero‐point vibrations of the phonon system in the nanoparticles. Copyright © 2005 John Wiley & Sons, Ltd.