Size-dependent fivefold and icosahedral symmetry in silver clusters

Autor:	Michael M. Burns, Karo Michaelian, Joel H. Parks, Ignacio L. Garzón, Ryan M. Danell, Xiaopeng Xing, Martine N. Blom
Rok vydání:	2005
Předmět:	Physics Diffraction Electron diffraction Icosahedral symmetry Physics::Atomic and Molecular Clusters Order (ring theory) Crystal structure Atomic physics Symmetry (geometry) Condensed Matter Physics Open shell Electronic Optical and Magnetic Materials Ion
Zdroj:	Physical Review B. 72
ISSN:	1550-235X 1098-0121
DOI:	10.1103/physrevb.72.081405
Popis:	Trapped ion electron diffraction measurements on silver cluster cations, $\mathrm{Ag}_{n}{}^{+}$ for sizes $n=36--46,55$ at $\ensuremath{\sim}120\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ describe an evolution in structural symmetry with increasing cluster size. Diffraction patterns characterize fivefold symmetry at smaller sizes which evolves to icosahedral symmetry at $n=55$. Low energy isomer structures were identified by statistical search methods and optimized by density-functional calculations. Comparison of diffraction data with these theoretical structures confirms the presence of local order having fivefold symmetry for sizes $n=36--39,43$ and global order having icosahedral symmetry at the closed shell size $n=55$.
Databáze:	OpenAIRE
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