Strong-field electron tunnelling dynamics in atomic hydrogen

An atom in the presence an ultra-short pulse of light can significantly distort the binding potential and it is possible for an electron to tunnel though the atomic binding potential. The 'Attoclock' technique, proposed by [Nat.Phys \textbf{4}, 565 (2008)] has facilitated the experimental measurements of tunnelling dynamics, such as tunneling time of an electron through the binding atomic potential. Previous attoclock experiments hinted at zero-tunnelling delays, however, exact theoretical solutions were not available to study the ionization dynamics in detail. Atomic Hydrogen (H) is the simplest atomic system and can be solved exactly using 3D-TDSE. We use the attoclock technique to investigate tunnelling dynamics with H using COLTRIMS and 770nm, 6fs pulses at intensities from 0.165-0.39 PW/cm$^{\mathrm{2}}$. We compare these results with the full solution of 3D-TDSE.