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A new spin- and angle-resolved inverse photoemission setup with a low-energyelectron source is presented. The spin-polarized electron source, with acompact design, can decouple the spin polarization vector from the electronbeam propagation vector, allowing to explore any spin orientation at anywavevector in angle-resolved inverse photoemission. The beam polarization canbe tuned to any preferred direction with a shielded electron optical system,preserving the parallel beam condition. We demonstrate the performances of thesetup by measurements on Cu(001) and Au(111). We estimate at room temperaturethe energy resolution of the overall system to be $\sim170$ meV from$k_{B}T_{eff}$ of a Cu(001) Fermi level, allowing a direct comparison tophotoemission. The spin-resolved operation of the setup has been demonstratedby measuring the Rashba splitting of the Au(111) Shockley surface state. Theeffective polarization of the electron beam is $P=30\pm3$ \% and the wavevectorresolution is $\Delta k_{F}\lesssim0.06$ \AA$^{-1}$. Measurements on theAu(111) surface state demonstrate how the electron beam polarization directioncan be tuned in the three spatial dimensions. The maximum of the spin asymmetryis reached when the electron beam polarization is aligned with the in-planespin-polarization of the Au(111) surface state.

Spin- and angle-resolved inverse photoemission setup with spin orientation independent from electron incidence angle