Infrared study of UV/EUV irradiation of naphthalene in H2O+NH3 ice

Y. J. Chen, M. Nuevo, F. C. Yeh, T. S. Yih, W. H. Sun, W. H. Ip, H. S. Fung, Y. Y. Lee, C. Y.R. Wu

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

1 Scopus citations


We have carried out photon irradiation study of naphthalene (C10H8), the smallest polycyclic aromatic hydrocarbon (PAH) in water and ammonia ice mixtures. Photons provided by a synchrotron radiation light source in two broad-band energy ranges in the ultraviolet/near extreme ultraviolet (4-20 eV) and the extreme ultraviolet (13-45 eV) ranges were used for the irradiation of H2O+NH3+C10H8 = 1:1:1 ice mixtures at 15K. We could identify several photo-products, namely CH4, C2H6, C3H8, CO, CO2, HNCO, OCN-, and probably quinoline (C9H7N) and phenanthridine (C13H9N). We found that the light hydrocarbons are preferably produced for the ice mixture subjected to 4-20 eV photons. However, the production yields of CO, CO2, and OCN- species seem to be higher for the mixture subjected to EUV photons (13-45 eV). Therefore, naphthalene and its photo-products appear to be more efficiently destroyed when high energy photons (E > 20 eV) are used. This has important consequences on the photochemical evolution of PAHs in astrophysical environments.

Original languageEnglish
Title of host publicationAdvances in Geosciences
Subtitle of host publicationVolume 7: Planetary Science (PS)
PublisherWorld Scientific Publishing Co.
Number of pages13
ISBN (Electronic)9789812708922
ISBN (Print)981270986X, 9789812709868
StatePublished - 1 Jan 2007


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