Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Weak intermolecular interactions in gas-phase NMR   Gas-phase NMR spectra demonstrating the effect of weak intermolecular forces
on the NMR shielding constants of the interacting species are reported. We
analyse the interaction of the molecular hydrogen isotopomers with He, Ne, and
Ar, and the interaction in the He-CO_2 dimer. The same effects are studied for
all these systems in the ab initio calculations. The comparison of the
experimental and computed shielding constants is shown to depend strongly on
the treatment of the bulk susceptibility effects, which determine in practice
the pressure dependence of the experimental values. Best agreement of the
results is obtained when the bulk susceptibility correction in rare gas
solvents is evaluated from the analysis of the He-rare gas interactions, and
when the shielding of deuterium in D_2-rare gas systems is considered.

28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph