Time-resolved imaging of nuclear motion and tunnelling with sub-femtosecond resolution
by
Alejandro Saenz(Humboldt University Berlin)
→
Europe/Stockholm
FB55
FB55
Description
An appealing aspect of nowadays available ultrashort laser
pulses is their potential for time-resolved imaging of quantum
dynamics down to the sub-femtosecond time-scale. Due to the high
non-linearity of the ionisation process in intense laser pulses,
i. e. the exponential dependence of the ionisation probability as a
function of the laser electric-field intensity, sub-cycle resolution is
possible. Different proposals and exploratory experimental studies exist
that aim for the imaging of electronic or nuclear motion using intense
ultrashort long-wavelength laser pulses. This talk will concentrate
on one scheme that was proposed and experimentally verified to reveal
time-resolved imaging of nuclear motion in molecules on the
sub-femtosecond time-scale. After an introduction to the
underlying physics and its demonstration on the example of
molecular hydrogen, an application to ammonia will be presented.
It is demonstrated that the proposed experiment allows for a real-time
imaging of nuclear quantum tunnelling with an extreme time resolution.