Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High resolution photoassociation spectroscopy of the $^{6}$Li$_2$
  $1^{3}\Sigma_{g}^{+}$ state   We present experimental observations of seven vibrational levels $v'=20-26$
of the $1^{3}\Sigma_{g}^{+}$ excited state of Li$_2$ molecules by the
photoassociation (PA) of a degenerate Fermi gas of $^6$Li atoms. For each
vibrational level, we resolve the rotational structure using a Feshbach
resonance to enhance the PA rates from p-wave collisions. We also, for the
first time, determine the spin-spin and spin-rotation interaction constants for
this state. The absolute uncertainty of our measurements is $\pm 0.00002$
cm$^{-1}$ ($\pm 600$ kHz). We use these new data to further refine an analytic
potential for this state.

14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci