Chemical constitution of a perfluoropolyether liquid surface. A photoelectron spectroscopic study

Angle resolved X-ray photoelectron spectroscopy from a liquid perfluoropolyether shows that its surface is primarily composed of chain ends oriented nearly perpendicular to the surface. Indirect evidence suggests that the ether oxygens may not be available for any of the surface processes. The results are in agreement with recent atomic beam scattering experiments and molecular dynamics simulations.