Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectroscopic characterization and detection of Ethyl Mercaptan in Orion   New laboratory data of ethyl mercaptan, CH$_{3}$CH$_{2}$SH, in the millimeter
and submillimeter-wave domains (up to 880 GHz) provided very precise values of
the spectroscopic constants that allowed the detection of
$gauche$-CH$_3$CH$_2$SH towards Orion KL. 77 unblended or slightly blended
lines plus no missing transitions in the range 80-280 GHz support this
identification. A detection of methyl mercaptan, CH$_{3}$SH, in the spectral
survey of Orion KL is reported as well. Our column density results indicate
that methyl mercaptan is $\simeq$ 5 times more abundant than ethyl mercaptan in
the hot core of Orion KL.

19
The categories of this paper are: eess
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
1
The categories of this paper are: cs