Monday, October 22, 2007, 1:00 pm — NSLS-II Seminar Room, Bldg. 817
Soft X-Ray Linear Dichroism: The Route from Spectra to Images K. Kaznatcheev, CLSI, Univ. of Saskatchewan, Saskatoon, Canada Scanning transmission X-ray microscopy (STXM) combines excellent orientation selectivity via linear dichroic Near Edge X-ray Absorption Spectra (NEXAFS), and high spatial resolution, limited at present by x-ray optics manufacturing to ~15 nm. STXM is an ideal tool to probe molecular order and to build molecular orientation map at spatial resolution 1-2 orders of magnitude better than optical. Samples are not limited to highly ordered crystals and films, but can be non-crystalline, inhomogeneous and partially oriented specimens, such as liquid crystals (LC). Recently commissioned soft X-ray spectromicroscopy beamline at the Canadian Light Source (CLS) has been optimized for such studies [1]. I will present experimental study of LC thin film texture in (a) binary mixture forming a SmAb phase [2], (b) lyotropic chromonic liquid crystals, and (c) discuss the role of surfactant and ion additives on LC texture. These experiments suggest that the in-plane LC director can be reconstructed with ~5% (magnitude) and ~5 degrees
Hosted by: John Hill
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