Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long-range interactions for He($n S$)--He$(n' S)$ and He($n S$)--He$(n'
  P)$   The energetically lowest five states of a helium atom are: He($1^1S$),
He($2^3S$), He($2^1S$), He($2^3P$), and He($2^1P$). Long-range interaction
coefficients $C_3$, $C_6$, $C_8$, $C_9$, and $C_{10}$ for all $S-S$ and $S-P$
pairs of these states are calculated precisely using correlated wave functions
in Hylleraas coordinates. Finite nuclear isotope mass effects are included.

11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math