A computer-controlled setup for studying spin-polarized electron photoemission

The setup is intended for studying spectral dependences of the quantum yiel d and the degree of polarization of a beam of photoelectrons emitted from s emiconductor heterostructures irradiated by circularly polarized light in a wavelength range of 360-1200 nm. The beam polarization vector direction ca n be reversed without affecting the main electron-optical features of the b eam. The polarization of electrons is measured by a mini-Mott polarimeter w ith an operating voltage of 30 kV. The vacuum setup has a load-lock system for quick loading of samples and a cryostat. The setup is fully computer-co ntrolled. Electron beams with a polarization of up to 88% were obtained wit h photocathodes at room temperature.