Three Dimensional Electron Momentum Density of Graphite by (X, , eX) Spectroscopy with a Time of Flight Electron Energy Spectrometer

Abstract

The coincidence measurement between the Compton scattered photonand the recoiled electron (X, , eX) provides direct information onthe three dimensional electron momentum density (3D-EMD).A new coincidence measurement system, which gives us the energyspectrum of the recoiled electron by the means of time of flight method, has been successfully developed. The obtained momentum spaceresolution of the 3D-EMD was 0.30 a.u., and thefeasibility of measuring the state-selective 3D-EMD has beendemonstrated by using an electron binding energy effect.The 3D-EMD of a graphite foil is compared with a theoretical bandcalculation, within a present statistical accuracy. The effectof multiple scattering of recoiled electrons was calculated by aMonte-Carlo simulation and the experimental data were compared with them.