Speaker
Manfred Lein
(Leibniz Universität Hannover)
Description
In previous studies of the attosecond scale temporal structure of
strong-field ionization in atoms driven by few-cycle pulses using
the "attoclock" scheme,
a one-to-one correspondence between photoelectron momentum and
time of ionization on the basis of outgoing electron
trajectories has been used. We introduce a purely quantum mechanical
and trajectory-free definition of the ionization time. For circular
polarization, we show that the strongest ionization takes place
without delay at the time of highest field strength.
In contrast, the bicircular attoclock using two counter-rotating circular
fields exhibits non-negligible ionization
delays. We also show simulations results for rescattering beyond the
electric dipole approximation in linearly polarized light,
demonstrating considerable forward momentum shifts of the high-energy
photoelectrons due to radiation pressure.
Primary author
Manfred Lein
(Leibniz Universität Hannover)
