Please see slide 2 for the caption of this figure. Rev. Sci. Instrum. 85, 083102 (2014); http://dx.doi.org/10.1063/1.4891417 © 2014 AIP Publishing LLC

FIG. 1. (a) Schematic of an NHG-RA experiment FIG. 1. (a) Schematic of an NHG-RA experiment. The scattering plane (light blue) is defined by the incident (red arrow) and radiated (dark blue arrow) beams. S(P)-polarization denotes an electric field pointing perpendicular (parallel) to the scattering plane. ϕ is the angle that the crystalline axis x ′ makes with respect to the scattering plane axis x upon rotation about the surface normal z = z ′ axis. (b) Simulated RA patterns for a χ i j k l e e e e process using arbitrary magnitudes for the independent non-zero tensor components allowed from a C 4h crystallographic point group.