Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum and classical features of the photoionization spectrum of
  C$_{60}$   By considering photoionization of the C$_{60}$ fullerene, we elucidate the
contributions of various classical and quantum physics phenomena appearing in
this process. By comparing the results, based on the {\it ab initio} and model
approaches, we map the well-resolved features of the photoabsoprtion spectrum
to single-particle and collective excitations which have the different physical
nature. It is demonstrated that the peculiarities arising in the
photoionization spectrum of C$_{60}$ atop the dominating plasmon excitations
have the quantum origin. In particular, we demonstrate that a series of
individual peaks can be assigned either to the optically allowed discrete
transitions or to ionization of particular molecular orbitals of the system.
The analysis performed gives a detailed information on the nature of numerous
features in the photoabsorption spectrum of C$_{60}$.

37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th