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Astronomical evolution mechanism of small size polycyclic aromatichydrocarbon (PAH) was analyzed using the first principles quantum-chemicalcalculation. Starting model molecule was benzene (C6H6), which would betransformed to (C5H5) due to carbon void created by interstellar high speedproton attack. In a protoplanetary disk around a young star, molecules would beilluminated by high energy photon and ionized to be cationic-(C5H5).Calculation shows that from neutral to tri-cation, molecule keeps originalconfiguration. At a step of sixth cation, there occurs surprising creation ofcyclic-C3H2, which is the smallest PAH. Astronomical cyclic-C3H2 had beenidentified by radio astronomy. Deep photoionization of cyclic-C3H2 bringssuccessive molecular change. Neutral and mono-cation keep cyclic configuration.At a step of di-cation, molecule was transformed to aliphatic chain-C3H2.Finally, chain-C3H2 was decomposed to pure carbon chain-C3 and two hydrogenatoms. Calculated infrared spectrum of those molecules was applied to observedspectrum of Herbig Ae young stars. Observed infrared spectrum could bepartially explained by small molecules. Meanwhile, excellent coincidence wasobtained by applying a larger molecules as like (C23H12)2+ or (C12H8)2+.Infrared observation is suitable for larger molecules and radio astronomy forsmaller asymmetric molecules. It should be noted that these molecules could beidentified in a natural way introducing two astronomical phenomena, that is,void-induced molecular deformation and deep photoionization.

Astronomical Creation of Cyclic-C3H2 and Chain-C3 Due to Interstellar Deep Photoionization