Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collisional $^{3}$He and $^{129}$Xe frequency shifts in Rb--noble-gas
  mixtures   The Fermi-contact interaction that characterizes collisional spin exchange of
a noble gas with an alkali-metal vapor also gives rise to NMR and EPR frequency
shifts of the noble-gas nucleus and the alkali-metal atom, respectively. We
have measured the enhancement factor $\kappa_{0}$ that characterizes these
shifts for Rb-$^{129}$Xe in the high-pressure limit to be 493$\pm$31, making
use of the previously measured value of $\kappa_{0}$ for Rb-$^{3}$He. This
result allows accurate $^{129}$Xe polarimetry with no need to reference a
thermal-equilibrium NMR signal.

27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th