Azimuthal-rotation sample holder for molecular orientation analysis

Abstract

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.

Resonant photoemission spectroscopy of atomic layer Fe2N on Cu(111) with continuous angular rotation of linearly polarized light

“…Moreover, this method is incompatible with operando measurements where sample size and motion are severely restricted. To meet the increasing demand of such measurements, one pathway is to develop a sophisticated sample rotation system [14]. Instead, we have recently developed an XAS system with rotatable linear polarization angle at SPring-8 BL07LSU using a segmented cross undulator [4,5,[15][16][17].…”