Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Molecular processes from the AGB to the PN stage   Many complex organic molecules and inorganic solid-state compounds have been
observed in the circumstellar shell of stars (both C-rich and O-rich) in the
transition phase between Asymptotic Giant Branch (AGB) stars and Planetary
Nebulae (PNe). This short (~100-10.000 years) phase of stellar evolution
represents a wonderful laboratory for astrochemistry and provides severe
constraints on any model of gas-phase and solid-state chemistry. One of the
major challenges of present day astrophysics and astrochemistry is to
understand the formation pathways of these complex organic molecules and
inorganic solid-state compounds (e.g., polycyclic aromatic hydrocarbons,
fullerenes, and graphene in the case of a C-rich chemistry and oxides and
crystalline silicates in O-rich environments) in space. In this review, I
present an observational review of the molecular processes in the late stages
of stellar evolution with a special emphasis on the first detections of
fullerenes and graphene in PNe.

37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas