TABLE I.

Time and energy resolution performance: $\Delta E_{\hspace{0.17em}\text{exp}}$, experimental energy resolution, including optical elements broadening and analyzer resolution; the electrons and photons per second are provided for the space charge free condition allowing for the overall energy resolution of 22 meV (9 pA at 16.9 eV and 200 kHz); $\Delta t_{\hspace{0.17em}\text{exp}}$, experimental time resolution, measured as convolution between pump and probe pulses; $\Delta E_{\mathit{probe}}$, harmonic bandwidth, after deconvolution of temperature and analyzer contribution; $\Delta t_{\mathit{probe}}$ probe pulse time duration; $\Delta t_{FT}$, estimation of Fourier transform pulse duration, obtained considering a time-bandwidth product $\approx$ 0.44.

Parameter	Value
Photon energy (eV)	16.9
Rep. Rate (kHz)	200
$\Delta E_{\hspace{0.17em}\text{exp}}$ (meV)	22
Electrons/s	$\approx$ 3 × 107
Photons/s	$\approx$ 5 × 108
$\Delta t_{\hspace{0.17em}\text{exp}}$ (fs)	300
$\Delta E_{\mathit{probe}}$ (meV)	19
$\Delta t_{\mathit{probe}}$ (fs)	105
$\Delta t_{FT}$ (fs)	96