  We present experimental data on the non-adiabatic strong field ionization of
atomic hydrogen using elliptically polarized femtosecond laser pulses at a
central wavelength of 390 nm. Our measured results are in very good agreement
with a numerical solution of the time-dependent Schr\"odinger equation (TDSE).
Experiment and TDSE show four above-threshold ionization (ATI) peaks in the
electron's energy spectrum. The most probable emission angle (also known as
'attoclock-offset angle' or 'streaking angle') is found to increase with
energy, a trend that is opposite to standard predictions based on Coulomb
interaction with the ion. We show that this increase of deflection-angle can be
explained by a model that includes non-adiabatic corrections of the initial
momentum distribution at the tunnel exit and non-adiabatic corrections of the
tunnel exit position itself.
