An atom or molecule interacting with an intense, ultrafast laser pulse is a fundamental problem in modern physics. At intensities that are approximately one-tenth an atomic unit of field (50 V/A) the physics is well described by a semi-classical 3-step model where an electron tunnel ionizes, driven by the strong-field and then rescatters with its parent core. The consequence of this physics...
We demonstrate control of photoelectron emission in two-color photoionization through electron wavepacket interference, using attosecond pulse trains with either two or three pulses together with a few-cycle IR dressing field at a fixed delay.
We directly measure electron-ion scattering phase shifts in atomic systems using optical interferometry in the extreme ultraviolet domain. Our method reveals partial-wave scattering phase shifts and structural phase jumps, enabling studies of multielectron phenomena.
We demonstrate imaging of bound electron wave packets following ionization. Using a pump-probe-deflect scheme, a superposition of spin-orbit states is prepared in Ar$^+$ and a movie of the wave packet evolution is recorded.
The time-dependent plasmonic response of C$_{60}$ is revealed through attosecond streaking spectroscopy. The streaking delay as a function of the electron energy shows a decaying trend including zero-crossing, as a signature of photo-induced collective excitation.
We reconstruct the temporal evolution of the density matrix of an autoionizing electron wavepacket using attosecond quantum state reconstruction with high spectral and temporal resolution.
