Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $R$-matrix calculations of electron collisions with lithium atom at low
  energies   $R$-matrix calculations of the electron collisions with lithium atom at
energies below the $3s$ excitation threshold are presented. The $^1S^e$,
$^3S^e$ and $^1P^o$ phase shifts calculated in the near-threshold energy range
are in excellent agreement with previous theoretical studies. The threshold
behavior of the $^3P^o$ phase shift is accurately analyzed along with the
resonance located at the scattering energy $\sim60$ meV. The phase shifts and
cross sections calculated here show two resonances below the $3s$ threshold
that have not been previously reported.

13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom