Photoelectron Spectroscopy of Liquids up to 21.2 eV.
NEW YORK UNIV N Y DEPT OF CHEMISTRY
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Photoelectron spectroscopy of liquids is investigated at variable photon energy up to 10 eV and with rare-gas resonance lines at 11.7 ArI, 16.8 NeI, and 21.2 HeI eV. Seven liquids are studied N-methylaniline, N,N-dimethyl-p-toluidine, formamide, hexamethyl phosphoric triamide, tetraglyme, ethylene glycol, and n-decanol. Energy distribution curves display at the higher photon energies a band structure matching the sequence of bands in the corresponding gas-phase photoelectron spectra. The bands are attributed to emission of unscattered electrons no loss of kinetic energy to the liquid, whereas the underlying background is ascribed to scattered in the liquid electrons. Quantitative treatement based on this interpretation agrees with experiment. Energies characterizing either bulk or surface photoionization are determined within or - 0.1 eV. The gas-liquid red shift 0.9 to 1.4 eV and bulk-surface blue shift 0.5 to 1.3 eV in photoionization energies are interpreted in terms of electronic polarization of the liquid medium. This is, to our knowledge, the first investigation of liquids by ultraviolet photoelectron spectroscopy above 10 eV. Author
- Nuclear Physics and Elementary Particle Physics