Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: N_2O weak lines observed between 3900 and 4050 cm^-1 from long path
  absorption spectra   Previously unobserved nitrous oxide transitions around 2.5 $\mu$m are
measured by intracavity laser absorption spectroscopy (ICLAS) analyzed by
time-resolved Fourier transform (TRFT) spectrometer. With an accuracy of the
order of 10^-3 cm^-1, measured positions of 1637 assigned weak transitions are
provided. They belong to 42 vibrational transitions, among which 33 are
observed for the first time. These data are believed to be useful in particular
to monitoring atmosphere purposes.

33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an