  The toolbox for time-resolved direct measurements of electron dynamics covers
a variety of methods. Since the experimental effort is increasing rapidly with
achievable time resolution, there is an urge for simple and robust measurement
techniques. Within this paper prove of concept experiments and numerical
simulations are utilized to investigate the applicability of a new setup for
the generation of ultrashort electron pulses in the energy range of 300 eV up
to 1.6 keV. The experimental approach combines an in-vacuum liquid microjet and
a few-cycle femtosecond laser system, while the threshold for electron impact
ionization serves as a gate for the effective electron pulse duration. The
experiments prove that electrons in the keV regime are accessible and that the
electron spectrum can be easily tuned by laser intensity and focal position
alignment with respect to the water jet. Numerical simulations show that a
sub-picosecond temporal resolution is achievable.
