Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phonon propagation scale and nanoscale order in vitreous silica from
  Raman spectroscopy   For nanoscale systems such as nanoparticles and 3D-bonded networks, the range
of spatial coherence is well reflected in the Raman spectral pattern. For
confined, or localized, phonons, the range of q-points contributing to the
spectrum depends on the phonon confinement length, which makes possible to
derive the size information from the spectra. In this work, Raman spectrum of
vitreous silica is described as localized phonons of SiO2 network. The
convergence of the spectral pattern with the confinement size is studied. It is
shown that the phonon propagation scale in vitreous silica is within the 0.5-2
nm range.

12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org