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Tetra(alkyl)onium salts are hydrophobic in polar solvents due to their CH 2 -/CH 3 -groups. The segregation leads to formation of an equilibrium structure at the liquid surface which is monitored with the extremely surface sensitive method MIES (Metastable Induced Electron Spectroscopy). It is found that the surface activity as well as the formation of a surface layer strongly depends...
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