Void induced molecule c23h12++ could reproduce the infrared spectrum (3
  to 20 micron) of interstellar gas and dust
  In order to find out a selected number of molecules to reproduce the infrared
spectrum of interstellar gas and dust, model coronene molecules with void and
charge have been computed using density functional theory. Among them, a single
void induced cation C23H12++ have successfully reproduced a wide range spectrum
from 3 to 20 micron of typical interstellar gas and dust. Well known
astronoically observed emission peaks are 3.3, 6.2, 7.6, 7.8, 8.6, 11.2, 12.7,
13.5 and 14.3 micro meter. Whereas, calculated peaks of C23H12++ were 3.2, 6.4,
7.6, 7.8, 8.6, 11.4, 12.9, 13.5, and 14.4 micron meter. It should be noted that
a single kind of molecule could reproduce very well not depending on the
decomposition method using many polycyclic aromatic hydrocarbon (PAH) data.
Such coincidence suggested that some astronomical chemical evolution may select
a particular PAH. Molecular sructure of C23H12++ was dramatically deformed by
the Jahn-Teller effect. There is a featured carbon skeleton having two
pentagons connected to highly symmetrical five hexagons. Such unique structure
brings above infrared mode.
