Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phosphorous chemistry in the shocked region L1157 B1   We study the evolution of phosphorous-bearing species in one-dimensional
C-shock models. We find that the abundances of P-bearing species depend
sensitively on the elemental abundance of P in the gas phase and on the
abundance of N atoms in the pre-shock gas. The observed abundance of PN and the
non-detection of PO towards L1157 B1 are reproduced in C-shock models with
shock velocity v=20km s-1 and pre-shock density n(H2) =10^4 - 10^5, if the
elemental abundance of P in the gas phase is 10^-9 and the N-atom abundance is
n(N)/nH - 10^-5 in the pre-shock gas. We also find that P-chemistry is
sensitive to O- and N-chemistry, because N atoms are destroyed mainly by OH and
NO. We identify the reactions of O-bearing and N-bearing species that
significantly affect P chemistry.

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The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ