Azimuthal-rotation sample holder for molecular orientation analysis

In this study, an azimuthal-rotation sample holder compatible with scanning transmission X-ray microscopy was developed. This holder exhibits improvement in the accuracy of rotation angles and reduces the displacement of the rotation axes during azimuthal rotation by using a crossed roller bearing. To   evaluate the performance of the holder, the authors investigated the dependence of the optical density around the C K-edge absorption of π -orbital-oriented domains in natural spherical graphite on the rotational angle by using linearly horizontally and vertically polarized undulator radiation. Based on the dependence of the optical density ratio between C 1s → π * and 1s → σ * excitation on the polarization angle of the X-rays, the average two-dimensional orientation angle of the π orbital in each position in a natural spherical graphite sample was visualized.
Source: Journal of Synchrotron Radiation - Category: Physics Authors: Tags: scanning transmission X-ray microscopy X-ray absorption near edge orbital orientation chemical structure carbon research papers Source Type: research
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