Nonadiabatic Coulomb effects in strong-field ionization in circularly polarized laser fields

摘要

We develop the recently proposed analytical R-matrix (ARM) method to encompass strong-field ionizationnby circularly polarized fields, for atoms with arbitrary binding potentials. Through the ARM method, the effectnof the core potential can now be included consistently both during and after ionization. We find that Coulombneffects modify the ionization dynamics in several ways, including modification of (i) the ionization times, (ii) theninitial conditions for the electron continuum dynamics, (iii) the “tunneling angle” at which the electron “enters”nthe barrier, and (iv) the electron drift momentum. We derive analytical expressions for the Coulomb-correctednionization times, initial velocities, momentum shifts, and ionization rates in circularly polarized fields, fornarbitrary angular momentum of the initial state. We also analyze how nonadiabatic Coulomb effects modify (i)nthe calibration of the attoclock in the angular streaking method and (ii) the ratio of ionization rates from p− andnp+ orbitals, predicted by Barth and Smirnova [Phys. Rev. A 84, 063415 (2011)] for short-range potentials.