Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A simulation of the cluster structures in Ge-Se vitreous chalcogenide
  semiconductors   A structure of germanium selenide glasses is simulated by the featured
clusters built from the tetrahedral GeSe4 units up to the clusters with six
germanium atoms (Ge6Se16H4 and Ge6Se16H8). Quantum chemical calculations at the
DFT level with effective core potentials for Ge and Se atoms for the clusters
of different composition reveal their relative stability and optical
properties.

31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th