  In this paper, we discuss effects of space charge fields on imaging
performance in a single shot time-resolved electron microscope (TEM). Using a
Green's function perturbation method, we derive analytical estimates for the
effects of space charge nonlinearity on the image formation process and the
associated aberration coefficients. The dependence of these coefficients on the
initial beam phase space distribution is elucidated. The results are validated
by particle tracking simulations and provide fundamental scaling laws for the
trade-off between temporal and spatial resolution in single-shot time-resolved
TEM.
