The Optical Spectrum of a Large Isolated Polycyclic Aromatic Hydrocarbon: Hexa-peri-hexabenzocoronene, C42H18
作者： Thomas D. Varberg , Klaas Nauta , Tyler P. Troy , Timothy W. Schmidt , Timothy W. Schmidt
DOI: 10.1086/590207
关键词: Ionization 、 Interstellar medium 、 Physics 、 Polycyclic aromatic hydrocarbon 、 Oscillator strength 、 Molecular electronic transition 、 Spectroscopy 、 Photochemistry 、 Visible spectrum 、 Carbon
摘要: The first optical spectrum of an isolated polycyclic aromatic hydrocarbon large enough to survive the photophysical conditions interstellar medium is reported. Vibronic bands electronic transition all-benzenoid hexa-peri-hexabenzocoronene were observed in 4080-4530 A range by resonant 2-color 2-photon ionization spectroscopy. strongest feature at 4264 estimated have oscillator strength f = 1.4 × 10−3, placing upper limit on abundance this 4 1012 cm−2, accounting for a maximum ~0.02% carbon. This study opens up possibility rigorously test neutral hydrocarbons as carriers diffuse near future.
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