Light-Induced Electron Emission from Surfaces of Organic Liquids
The method of Ultraviolet Photoelectron Emission (UPE) is described and has been applied to determine the total quantum yield of photoelectrons by excitation from the energy threshold up to several electron volts above it in the energy range between 6 and 11 eV. Several high-molecular organic liquids were studied, which have a vapor pressure smaller than 10-4 Pa at room temperature. The results of several phthalates and long chain hydrocarbons such as squalane and squalene are discussed, σ- and π-bonds show different threshold energies. The total quantum yields approach a saturation value of 10-2 to 10-1 at three electron volts above the threshold.
KeywordsCobalt Aldehyde Carbonyl Ketone Alkane
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