Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 123, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2116907
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We examine the utility of photoelectron spectroscopy (PES) as a structural probe of Si-n(-) in the n=20-26 size range by determining isomers and associated photoelectron spectra from first principles calculations. Across the entire size range, we consistently obtain a good agreement between the theory and experiment [Hoffmann , Eur. Phys. J. D 16, 9 (2001)]. We find that PES can almost invariably distinguish between structurally distinct isomers at a given cluster size, but that structurally similar isomers usually cannot be reliably distinguished by PES. For many, but not all, sizes the isomer giving the best match to experiment is the lowest-energy one found theoretically. Thus, combining theory with PES experiments emerges as a useful source of structural information even for intermediate size clusters. (c) 2005 American Institute of Physics.
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