Abstract
Electron emission from low vapor pressure liquids induced by vacuum ultravoilet light was measured as a function of photon energy between 6 eV and 10.8 eV. Absolute quantum yields were determined for 17 organic compounds comprising hydrocarbons, phthalates, phosphates, dicarboxylic esters, amines and polysiloxane fluids. The quantum yields rise from 10 −6 to 10 −1 with increasing photon energy. Systematic changes of the yields with the molecular structure of the liquids were observed. The photoemission threshold energies of 11 liquids have been determined in this work. The electron energy levels and the photoemission process are discussed by taking into account the electronic properties of the isolated molecules, the influence of charge polarization, and the transport of hot electrons through the liquid/vapor interface.
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