NEXAFS measurements of the molecular ordering in the boundary layers of liquid crystalline free standing films |
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| Authors: | P Fortmeier T Risse H Stegemeyer H-J Freund |
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| Institution: | 1. Institute of Physical Chemistry, University of Paderborn, D-33098 Paderborn, Germany;2. Dept. of Chemical Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, D-14195 Berlin, Germany |
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| Abstract: | By near edge X-ray absorption fine-structure (NEXAFS) spectroscopy a finite molecular tilt angle in the surface layer of a free standing film in the liquid crystalline smectic A phase of C7 was directly detected. Analysis of the angular dependent intensities of the oxygen K edge NEXAFS spectra leads to an average tilt angle of the molecules in the surface layer of about 34°, which is characteristic for the bulk smectic C* phase of C7. |
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