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• W2314972261 abstract "Reactions of 18O2 with self-assembled monolayer (SAM) films of 1-dodecanethiol, 1-octadecanethiol, 1-butanethiol, and benzyl mercaptan chemisorbed on gold were studied by the electron stimulated desorption (ESD) of anionic fragments over the incident electron energy range 2–20 eV. Dosing the SAMs with 18O2 at 50 K results in the ESD of 18O– and 18OH–. Electron irradiation of samples prior to 18O2 deposition demonstrates that intensity of subsequent 18O– and 18OH– desorption signals increase with electron fluence and that in the absence of electron preirradiation, no 18O– and 18OH– ESD signals are observed, since oxygen is unable to bind to the SAMs. A minimum incident electron energy of 6–7 eV is required to initiate the binding of 18O2 to the SAMs. O2 binding is proposed to proceed by the formation of CHx–1• radicals via resonant dissociative electron attachment and nonresonant C–H dissociation processes. The weaker signals of 18O– and 18OH– from short-chain SAMs are related to the latter’s resistance to electron-induced damage, due to the charge-image dipole quenching and electron delocalization. Comparison between the present results and those for DNA oligonucleotides self-assembled on Au (Mirsaleh-Kohan, N. et al. J. Chem. Phys. 2012, 136, 235104) indicates that the oxygen binding mechanism is common to both systems." @default.
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• W2314972261 date "2013-04-15" @default.
• W2314972261 modified "2023-10-17" @default.
• W2314972261 title "Oxygen Attachment on Alkanethiolate SAMs Induced by Low-Energy Electron Irradiation" @default.
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• W2314972261 doi "https://doi.org/10.1021/la400549g" @default.
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