Compton scattering experiments with monochromatic W Kα₁ radiation

Abstract

Construction and performance of a spectrometer based on a high-voltage generator and W-anode X-ray tube are described. W Kct~ radiation is monochromatized using a bent Ge (400) crystal. The obtained monochromatic flux is l0 T photons s-~ and the beam size at the focal point 15 x 0.5ram. Comparison is made with a 241Am v-ray source, which has an almost equal photon energy. The W K~ I beam does not exhibit the low-energy tail typical for the ";-ray source but, on the other hand, a small contribution of doublet energy was observed. Directional Compton profiles of pyrolytic graphite were measured with both sources and essentially the same features were found.

Momentum-density effects upon the electronic stopping of elemental solids

“…Because of the dominance of π-electron bonding in graphite, a significant anisotropy for q parallel versus perpendicular to the c-axis is expected. Such anisotropy is seen experimentally in the Compton profile [45,46]. Figure 3 shows the calculated proton stopping curves in the direction [0001] for equilibrium graphite.…”

The absolute double-differential Compton scattering cross section of Cu 1s electrons

“…The measurement geometry was also chosen so that the fluorescence was measured at an angle close to the surface normal to reduce the absorption, and the incident beam was aligned to hit the sample at very much a glancing angle to increase the radiated volume and thus the counting rate. The x-ray source is based on a W-anode x-ray tube operated in this work at the voltage of 150 kV and current of 3.8 mA [10]. The W Kα 1 radiation was separated from the continuous x-ray spectrum using a bent Ge(400) monochromator in a symmetric reflection geometry.…”

Anisotropy of the Electron Momentum Distribution in Pyrolytic Graphite Studied Using a WKa1 Spectrometer

“…The detailed description of the spectrometer is published elsewhere [17] and only a brief summary is given here. The x-ray source is a sealed tube with W-target.…”