Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fine Structure in Energy Spectra of Ultrasmall Au Nanoparticles   We have studied tunneling into individual Au nanoparticles of estimated
diameters 2-5 nm, at dilution refrigerator temperatures. The I-V curves
indicate resonant tunneling via discrete energy levels of the particle. Unlike
previously studied normal metal particles of Au and Al, in these samples we
find that the lowest energy tunneling resonances are split into clusters of
2-10 subresonances. Such effects appear to be increasingly important in smaller
grains, as might be expected from the larger characteristic energies.

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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph