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Here we report on a novel High Harmonic Generation (HHG) light sourcedesigned for space charge free ultrafast photoelectron spectroscopy (PES) onsolids. The ultimate overall energy resolution achieved on a polycrystalline Ausample is ~22 meV at 40 K. These results have been obtained at a photon energyof 16.9 eV with a pulse bandwidth of ~19 meV, by varying, up to 200 kHz, thephoton pulses repetition rate and the photon fluence on the sample. Thesefeatures set a new benchmark for tunable narrowband HHG sources. By comparingthe PES energy resolution and the photon pulse bandwidth with a pulse durationof ~105 fs, as retrieved from time-resolved (TR) angle resolved (AR) PESexperiments on Bi$_2$Se$_3$, we validate a way for a space charge freephotoelectric process close to Fourier transform limit conditions for ultrafastTR-PES experiments on solids.

Space Charge Free Ultrafast Photoelectron Spectroscopy on Solids by a Narrowband Tunable Extreme Ultraviolet Light Source