Improvements on the third generation of electron momentum spectrometer

The significant modifications to our recently constructed electron momentum spectrometer have been implemented. Compared with our previous report, the energy and the angle resolutions are significantly improved and reach ΔE=0.45eV, Δ\theta=±0.53^o and Δ\phi=±0.84^o, respectively. Moreover, the details of data reduction and the relation between azimuthal angle range and the sensitivity are discussed.