Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Raman spectroscopy of femtosecond multi-pulse irradiation of vitreous
  silica: experiment and simulation   We report an experimental and numerical study of femtosecond multi-pulse
laser-induced densification in vitreous silica (v-SiO2) and its signature in
Raman spectra. We compare the experimental findings to recently developed
molecular dynamics (MD) approach accounting for bond-breaking due to laser
irradiation, together with a dynamical matrix approach and bond polarizability
model based on first-principle calculations for the estimation of Raman
spectra. We observe two stages of the laser-induced densification and Raman
spectrum evolution: growth during several hundreds of pulses followed by
further saturation. At the medium-range, the network connectivity change in
v-SiO2 is expressed in reduction of major ring fractions leading to more
compacted structure. With the help of Sen & Thorpe model, we also study the
short-range order transformation and derive the interbonding Si-O-Si angle
change from the Raman measurements. Experimental findings are in excellent
agreement with our MD simulations, and, hence, support bond-breaking mechanism
of laser-induced densification. Thus, our modeling explains well the
laser-induced changes both in the short-range order caused by the appearance of
Si-coordination defects and medium-range order connected to evolution of the
ring distribution. Finally, our findings disclose similarities between
sheared-, permanently-densified- and laser-induced-glass and suggest
interesting future experiment in order to clarify the impact of the
thermo-mechanical history on glasses under shear, cold- and hot-compression,
and laser-induced densification.

20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex