Abstract
We analyze the two-dimensional angular momentum-energy distribution of electrons emitted from argon by short laser pulses. We identify characteristic features of both multiphoton and tunneling ionization in the partial-wave distribution for Keldysh parameters close to unity. We observe a remarkable degree of quantum-classical correspondence in the photoinization process which becomes even more pronounced after intensity averaging over the focal volume. We derive an energy-dependent cut-off for the highest angular momentum accessible within the framework of the strong-field approximation, which accurately reproduces the partial wave distributions found from solutions of the time-dependent Schrödinger equation.
Highlights
Differential electron spectra emitted from atoms, molecules and condensed matter by ultrashort strong few-cycle laser pulses have become available very recently [1, 2]
The starting point is the strong-field approximation (SFA), which we evaluate in the semiclassical limit, the saddle-point approximation (SPA)
We find a remarkable resemblance of classical-trajectory Monte-Carlo (CTMC) and time-dependent Schrodinger equation (TDSE) doubly-differential energy-angular momentum distributions after averaging over the focal volume
Summary
Differential electron spectra emitted from atoms, molecules and condensed matter by ultrashort strong few-cycle laser pulses have become available very recently [1, 2]. In the present communication we explore the partial-wave distribution in the continuum or, classically, the two dimensional distribution in the energy (E) and angular momentum (L) plane for strong-field ionization of argon by few-cycle NIR pulses in the transition regime between tunneling (Keldysh parameters γ < 1) and multiphoton ionization (γ > 1), see Ref.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
