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

The setup is intended for studying spectral dependences of the quantum yield and the degree of polarization of a beam of photoelectrons emitted from semiconductor heterostructures irradiated by circularly polarized light in a wavelength range of 360-1200 nm. The beam polarization vector direction can be reversed without affecting the main electron-optical features of the beam. The polarization of electrons is measured by a mini-Mott polarimeter with 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-controlled. Electron beams with a polarization of up to 88% were obtained with photocathodes at room temperature.