Intensity calibration and atomic imaging of size-selected Au and Pd clusters in aberration-corrected HAADF-STEM

We report an experimental calibration of the exponent α, which relates intensity (I) and atomic number (Z) in HAADF-STEM imaging. The method employs size-selected Au923 and Pd923 clusters in an aberration-corrected 200 kV microscope. We find α 1.46 ± 0.18 for an inner collection angle of 62 mrad. Th...

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Bibliographic Details
Published in:Journal of physics. Conference series 2012-01, Vol.371 (1), p.12010-4
Main Authors: Wang, Z W, Palmer, R E
Format: Article
Language:English
Subjects:
Aberration
Atomic properties
Atomic structure
Bimetals
Calibration
Clusters
Collection
Gold
Imaging
Microscopes
Palladium
Physics
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Summary:We report an experimental calibration of the exponent α, which relates intensity (I) and atomic number (Z) in HAADF-STEM imaging. The method employs size-selected Au923 and Pd923 clusters in an aberration-corrected 200 kV microscope. We find α 1.46 ± 0.18 for an inner collection angle of 62 mrad. The value of α is needed in the quantit!ative compositional analysis of, e.g., bimetallic nanostructures. The atomic structures of these two examples of size-selected magic-number clusters are also reported.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/371/1/012010