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• W2089987769 abstract "Electron-stimulated desorption (ESD) of neutrals from methanol-dosed Al(111) is studied using laser ionization at 193 nm coupled with time-of-flight (TOF) mass spectrometry. At room temperature and at very low laser intensity, mass spectrometry of the neutral ESD species indicates the presence of desorbing CH3O, the methoxy radical. At higher laser intensity, this species is efficiently photolyzed to C+ and HCO+ fragments. The velocity distributions of these photofragments, indicative of the velocity distribution of the methoxy parent, are measured for methanol dosed onto both clean and pre-oxidized single crystal surfaces. Both of the surfaces yield similar non-Boltzmann distributions with peak velocities of ∼ 900 m/s, corresponding to a peak kinetic energy of ∼ 0.1 eV for the methoxy parent. The similar results may find explanation in terms of oxidation of the Al(111) surface by the initial methanol exposure. The major ionic desorbate observed from this methanol-dosed Al(111) is H+, and its kinetic energy distribution peaks at ∼ 4 eV, a value which is typical of that observed in other ESD studies of ionic desorbates. The order of magnitude difference in kinetic energies between the desorbed ions and neutrals is discussed in terms of possible desorption mechanisms. Neutral ESD, combined with X-ray photoelectron spectroscopy (XPS) is also used as a probe of changes in surface adsorbate composition as a function of temperature and of electron beam dose for methanol/Al(111). The surface concentration of the methoxy species, as monitored via the HCO+ photofragment, is found to decrease linearly with increasing temperature. An increase in C+ signal at ∼ 470 K is attributed to the formation of a thermal decomposition product with either a higher desorption cross section or a higher laser ionization/fragmentation cross section than the methoxy species. Electron beam damage studies of the methoxy/aluminum system at an electron beam energy of 3 keV give a cross section of 3 ± 1 × 10−17 cm2 for loss of methoxy from the surface at this energy." @default.
• W2089987769 created "2016-06-24" @default.
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• W2089987769 date "1991-01-01" @default.
• W2089987769 modified "2023-10-17" @default.
• W2089987769 title "Electron-stimulated desorption of neutrals from methanol-dosed Al(111) - velocity distributions and adsorbate decomposition determined by nonresonant laser ionization" @default.
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• W2089987769 doi "https://doi.org/10.1016/0039-6028(91)90213-c" @default.
• W2089987769 hasPublicationYear "1991" @default.
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