Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microsolvation of Li$^+$ in small He Clusters. Li$^+$He$_n$ species from
  Classical and Quantum Calculations   A structural study of the smaller Li$^+$He$_n$ clusters with $n\le30$ has
been carried out using different theoretical methods. The structures and the
energetics of the clusters have been obtained using both classical energy
minimization methods and quantum Diffusion Monte Carlo. The total interaction
acting within the clusters has been obtained as a sum of pairwise potentials:
Li$^+$-He and He-He. This approximation had been shown in our earlier study
\cite{8} to give substantially correct results for energies and geometries once
compared to full ab-initio calculations. The general features of the spatial
structures, and their energetics, are discussed in details for the clusters up
to $n=30$ and the first solvation shell is shown to be essentially completed by
the first ten helium atoms.

2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph