  Ultrafast Electron Microscopy (UEM) has been demonstrated to be an effective
table-top technique for imaging the temporally-evolving dynamics of matter with
subparticle spatial resolution on the time scale of atomic motion. However,
imaging the faster motion of electron dynamics in real time has remained beyond
reach. Here, we demonstrate more than an order of magnitude (16 times)
enhancement in the typical temporal resolution of UEM by generating isolated 30
fs electron pulses, accelerated at 200 keV, via the optical-gating approach,
with sufficient intensity for efficiently probing the electronic dynamics of
matter. Moreover, we investigate the feasibility of attosecond optical gating
to generate isolated subfemtosecond electron pulses, attaining the desired
temporal resolution in electron microscopy for establishing the Attomicroscopy
to allow the imaging of electron motion in the act.
