Abstract
X-ray absorption spectroscopy measurements have been made on 7-, 12-,
and 23-nm palladium particles, along with bulk material as reference.
With decreasing particle size, the extended x-ray absorption fine
spectra reveal a substantial contraction of the nearest-neighbor
distance and a reduction of the average coordination number, but
an increasing Debye-Waller factor. Meanwhile, the x-ray absorption
near edge spectra show a decreasing density of unoccupied states
with decreasing particle size.
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