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

doi:10.1142/6494-vol7

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 proceeding › Chapter › peer-review

2 Scopus citations

Abstract

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 language	English
Title of host publication	Advances in Geosciences
Subtitle of host publication	Volume 7: Planetary Science (PS)
Publisher	World Scientific Publishing Co.
Pages	79-91
Number of pages	13
ISBN (Electronic)	9789812708922
ISBN (Print)	981270986X, 9789812709868
DOIs	https://doi.org/10.1142/6494-vol7
State	Published - 1 Jan 2007

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title = "Infrared study of UV/EUV irradiation of naphthalene in H2O+NH3 ice",

abstract = "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.",

author = "Chen, {Y. J.} and M. Nuevo and Yeh, {F. C.} and Yih, {T. S.} and Sun, {W. H.} and Ip, {W. H.} and Fung, {H. S.} and Lee, {Y. Y.} and Wu, {C. Y.R.}",

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T1 - Infrared study of UV/EUV irradiation of naphthalene in H2O+NH3 ice

AU - Chen, Y. J.

AU - Nuevo, M.

AU - Yeh, F. C.

AU - Yih, T. S.

AU - Sun, W. H.

AU - Ip, W. H.

AU - Fung, H. S.

AU - Lee, Y. Y.

AU - Wu, C. Y.R.

PY - 2007/1/1

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N2 - 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.

AB - 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.

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

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