Journal Article resonant inelastic X-ray scattering Research Support, U.S. Gov't, Non-P.H.S. X-ray optics 1C beamline Fluorocarbons Montel mirror Osmium Tetroxide P40W033BGM PLS-II RIXS RIXS spectrometer Research Support, Non-U.S. Gov't X-ray collimation electrocatalysis electronic structures/processes/materials epitaxy fluorocarbon 72 hard X-rays high pressure high-resolution monochromators intermetallic catalyst metamaterials multilayer mirror non-traditional crystal materials optically active materials oxygen reduction reaction polymer electrolyte membrane fuel cells scattered X-ray collimation structure-property relationships