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Interstellar infrared observation shows featured spectrum due to polycyclicaromatic hydrocarbon (PAH)at wavelength 3.3,6.2,7.6,7.8,8.6,and 11.3micrometer,which are ubiquitously observed in many astronomical dust clouds andgalaxies. Our previous first principles calculation revieled that viod inducedcoronene (C23H12)2+ and circumcoronene (C53H18)1+ could reproduce such spectrumvery well. In this study, quantum-mechanic origin was studied through atomicconfiguration change and atomic vibration mode analysis. By a high speedparticle attack, carbon void would be introduced in PAH. Molecularconfiguration was deformed by the Jahn-Teller quantum effect. Carbon SP3 localbond was created among SP2 graphene like carbon network. Also, carbontetrahedron local structure was created. Such peculiar structure is the quantumorigin. Those metamorphosed molecules would be photo-ionized by the centralstar strong photon irradiation resulting cation molecules. Atomic vibrationmode of cation molecule (C23H12)2+ was compared with that of neutral one(C23H12). At 3.3 micrometer, both molecules show show C-H stretching mode andgive fairly large infrared intensity. At 6.2,7.6,7.8, and 8.6 micrometer bands,cation molecule show complex C-C stretching and shrinking mixing modes andremain large infrared emission. Whereas, neutral molecule gives harmonicmotion, which cancelles each other resulting very small infrared intensity. At11.3 micrometer, both neutral and cation molecules show C-H bending motionperpendicular to a molecular plane, which contributes to strong emission.Actual observed spectrum would be a sum of such quantum-mechanic originedmolecules.

Astronomical Quantum-chemical Origin of Ubiquitously Observed Interstellar Infrared Spectrum due to Polycyclic Aromatic Hydrocarbon