期刊
FARADAY DISCUSSIONS
卷 217, 期 -, 页码 414-433出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8fd00229k
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资金
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy (DOE), through the Gas Phase Chemical Physics Program of the Chemical Sciences Division [DE-AC02-05CH11231]
- National Aeronautics and Space Administration (NASA) through the NASA Astrobiology Institute [NNH13ZDA017C]
Polycyclic aromatic hydrocarbons (PAHs) may comprise up to 20% of the carbon budget in our galaxy and most PAHs condense onto water-rich icy grain mantles. Benzene-water clusters have been invoked as model systems for studying the photo-processing of water ice mantles containing PAHs. However, there is a paucity of information on larger aromatics, where the extended pi cloud could affect photo-processing. In this study, tunable vacuum ultraviolet (VUV) photoionization of naphthalene-water clusters N-x(H2O)(y) (N denotes naphthalene) is performed using synchrotron radiation and analyzed by reflectron time-of-flight mass spectrometry. Naphthalene clusters up to x = 4 are generated as are naphthalene-water clusters up to y = 25. At low photon energy (<11 eV), the naphthalene moiety is ionized and there is no proton transfer from N+ to the water sub-cluster, which is very different from the benzene-water system. Protonated products, N[(H2O)(x)H](+) and OH radical addition product (NOH)[(H2O)(x)H](+) are generated above 11 eV, suggesting that water sub-clusters dominate the dynamics at high photon energies. Ab initio calculations are performed to decipher the experimental results. Energetics of the neutral structures N(H2O)(1-4) and their photoionized counterparts are calculated, including ionization on the N moiety as well as on the water sub-cluster. Energy decomposition analysis (EDA) is performed to understand trends in the binding between the naphthalene and the water sub-cluster in the ionized species.
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