Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fingerprints of antiaromaticity in the negative ion (Li$_3$Al$_4$)$^-$
  via an ab initio quantum-chemical study of the equilibrium structure of the
  inhomogeneous electron liquid   Fingerprints of antiaromaticity in the negative ion (Li$_3$Al$_4$)$^-$, this
species being realizable via a laser vaporization technique, are revealed by
means of an \emph{ab initio} quantum-chemical investigation. First, the
ground-state equilibrium geometry of this ion is predicted. Also, for the
corresponding inhomogeneous electron liquid, the characteristics of the HOMO
are studied, both for the square and the rectangular Al$_4$ geometry in two
low-lying isomers of the negative ion. There is no particular sensitivity to
the change in geometry of the Al$_4$ configuration. Therefore, we have
calculated theoretically chemical shifts (NICS), which contain remarkable
fingerprints of antiaromaticity. As to future directions, some comments are
added in relation to the Shannon entropy.

33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci