Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Room temperature propylene dehydrogenation and linear atomic chain
  formation on Ni(111)   The structures formed by propylene adsorption on Ni(111) at room temperature
are determined by a combination of scanning tunneling microscopy and density
functional theory. As a result of the interaction with the Ni(111) surface,
propylene molecules are dehydrogenated and coupled into linear hydrocarbon
chains. The length of the chains varies from 8 to 60A, with the most frequently
observed length of 18A. At saturated coverage, some chains are closed in rings
with a diameter of 6A. A C12H12 model is proposed for most often observed
chains. We demonstrate that the possibility of combining initial propylene
molecules into chains appears after dehydrogenation of the CH3 fragment.

17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph