Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Astronomical Infrared Spectrum of Planetary Nebula Lin49 and Tc1
  Identified by Ionized Polycyclic-Pure-Carbon C23 and C60   Astronomical dust molecule of carbon-rich nebula-Lin49 and nebula-Tc1 could
be identified to be polycyclic-pure-carbon C23 by the quantum-chemical
calculation. Two driving forces were assumed. One is high speed proton attack
on coronene-C24H12, which created void-induced C23H12. Another is high energy
photon irradiation, which brought deep photo-ionization and finally caused
dehydrogenation to be C23. Infrared spectrum calculation show that a set of
ionized C23 (neutral, mono, and di-cation) could reproduce observed many peaks
of 28 bands at wavelength from 6 to 38 micrometer. Previously predicted neutral
fullerene-C60 could partially reproduce observed spectrum by 5 bands. Also, we
tried calculation on ionized-C60, which show fairly good coincidence with
observed 10 bands

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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg