Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing interactions between Rydberg atoms with large electric dipole
  moments in amplitude modulated electric fields   Dipole-dipole interactions between helium atoms in Rydberg-Stark states with
principal quantum number $n=53$ and approximately linear Stark energy shifts,
resulting from induced electric dipole moments of approximately 7900 D, have
been investigated experimentally. The experiments were performed in pulsed
supersonic metastable helium beams, with particle number densities of up to
$\sim10^9$ cm$^{-3}$. In the presence of amplitude-modulated, radio-frequency
electric fields, changes in the spectral intensity distributions associated
with the transitions to these states that are attributed to dipole-dipole
interactions within the ensembles of excited atoms have been observed. The
experimental results are in excellent agreement with calculations of the
Rydberg energy level structure carried out using Floquet methods, and
excitations shared by up to 4 atoms. The use of these Rydberg-Stark states as
sensors for non-resonant broadband radio-frequency electrical noise is also
discussed.

11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin