Abstract
In order to clarify the probing depth of ultraviolet photoelectron yield spectroscopy, the escape depth (L) of photo- electrons with kinetic energy (Ek) lower than 1.5eV in hydrocarbon films was determined by using self-assembled monolayers ofn-alkylmercaptane adsorbed on gold. The yield of photoelectrons from the gold substrate decreased exponentially as the chain length of n-alkylmercaptane increased. TheLwas 1.0±0.1nm for electrons with Ek lower than 0.3eV, and increased to 3.0±0.9nm for electrons with the maximumEk of 1.5eV.
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