Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microscopic calculations on Raman scattering from acousitc phonons
  confined in Si nanocrystals   Raman scattering from the acoustic phonons confied in si nanocrystals is
investigated by a microscopic lattice-dynamical calculation. Polarized and
depolarized spectra are found to be rather different, indicated from different
acoustic phonons. The polarized scattering is more pronounced than the
depolarized one. The calculated results are compared with the recent
experimental data. The matrix effects are discussed.

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The categories of this paper are: dg-ga
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The categories of this paper are: eess
29
The categories of this paper are: funct-an
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The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
9
The categories of this paper are: nlin
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The categories of this paper are: patt-sol
3
The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn