Our current work focuses on understanding and resolving in space and time the dynamics of a hole created by ionization. To this end, we are developing theoretical foundations for a new type of spectroscopy - the so-called high harmonic generation spectroscopy of multi-electron dynamics [6,7,8,9]. This spectroscopy allows one to gain attosecond temporal resolution without relying on attosecond pulses - in fact, using pulses that are many tens of femtoseconds long. The [intlink id=”165” type=”page”]key principle[/intlink] of HHG spectroscopy of multielectron dynamics is the presence of multiple ionization -recombination channels and their interference in harmonic light.


Together with the group of Dr. Nirit Dudovich,  we have introduced  Two dimensional high harmonic spectroscopy.

We have used it to resolve the time, when electron exits from the tunneling barrier [10]  and to time-resolve few tens of attoseconds delays in tunneling from two orbitals in CO2 molecule.

Multidimensional high harmonic spectroscopy allows one to uniquely  identify the positions of dynamical minima [6] in high harmonic spectra. This information can be used to reconstruct hole dynamics in molecules.

Two dimensional high harmonic spectroscopy uses a combination of two orthogonally polarized fields: strong fundamental and weak second harmonic field with controlled delay between them.