Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some properties of a long lifetime strongly-coupled molecular plasma
  produced by high Rydberg excitation of nitric oxide in a supersonic free jet   A long life-time (>0.3 ms) strongly-coupled molecular Rydberg plasma is
generated by the excitation of nitric oxide into the high-n Rydberg threshold
region in the high-density region of a supersonic jet expansion. After 310 \mus
the plasma has expanded to a size of ca. 3 cm. When subjected to very small DC
fields from 0.2 to 1.0 V/cm the plasma reveals a much smaller high-density core
structure of only 0.6 cm. The molecular Rydberg plasma is observed over a broad
range of excitation energies, from threshold down to Rydberg states as low as n
= 19.

9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ