Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photochemical model of impact-produced lunar atmosphere   The Lunar Prospector mission detected hydrogen-containing compounds in the
lunar polar regions. We have considered the comet hypothesis of the origin of
polar volatiles on the Moon. In the present paper we use our model of a comet
impact with photochemical processes to be included to estimate chemical
composition of volatiles which can be captured by the cold traps.

15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin