Measurements of electron attenuation lengths in condensed molecular solids

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Electron attenuation lengths in condensed molecular solids have been measured utilizing monochromatized synchrotron radiation from the NBS SURF-II storage ring. The attenuation lengths are approximately 13, 10 and 9 Å, respectively, for water, methanol and cyclohexane and show only a slight energy dependence over the electron kinetic energy range covered (18-68eV). The experiment consisted of monitoring the attenuation of Cu(100) substrate photoelectrons as solid H2O, CH3OH and C6H12 were condensed at 90 K by dosing from a microcapillary array. Accurate measurement of adsorbate layer thickness was accomplished by calibration of the doser; this procedure is described in detail. Verification of this calibration was accomplished by comparison with thermal desorption and UV photoelectron spectroscopic measurements which are able to distinguish monolayers from multilayers. © 1986.

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Journal of Electron Spectroscopy and Related Phenomena

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