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: Harano, T. Takeichi, Y. Ohigashi, T. Shindo, D. Nemoto, E. Wakabayashi, D. Yamashita, S. Murao, R. Kimura, M. Tags: scanning transmission X-ray microscopy X-ray absorption near edge orbital orientation chemical structure carbon research papers Source Type: research