Regensburg 2010 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster: Electronic and Optical Properties of Organic Systems

CPP 12.3: Poster

Montag, 22. März 2010, 16:30–18:00, Poster C

Soft x-ray dichroism to explore the molecular orientation using scanning x-ray transmission microspectroscopy (STXM) — •Stephan Wenzel, Andreas Späth, Christian Hub, and Rainer H. Fink — ICMM, Univ. Erlangen, Egerlandstraße 3, 91058 Erlangen, Germany

Scanning transmission soft X-ray microspectroscopy (STXM) has proven excellent spatial resolution (< 20 nm) in combination with spectroscopic information to investigate ultrathin samples. The superior information relies on the photon-energy specific absorption which offers high elemental and chemical contrast. Soft x-ray linear dichroism is established to analyze the molecular orientations in thin film or bulk samples from the angle-dependant absorption. In conventional STXM, the incident angle is fixed by the microscopy geometry. We demonstrate how a rotational device can be used to derive the molecular orientations in organic nano- and microcrystals. We present microspectroscopic studies of TCNQ, NTCDA and NDCI-nanocrystals prepared on commercial Si3N4 membranes. We compare the derived structures from different spectral analysis routines, i.e. stack analysis of images and from line scans. The work is funded by the BMBF under contract 05KS7WE1.