Above-threshold ionization by an elliptically polarized field: interplay between electronic quantum trajectories
Measurements of energy-resolved angular distributions of electrons generated in above-threshold ionization of rare gases in a field with elliptical polarization are presented, with emphasis on the high-energy part of the spectra. The data show a second plateau at a specific angle with respect to the large component of the laser field. The results are compared to a calculation based on a strong-field rescattering approximation. This is interpreted in terms of the superposition of quantum trajectories. The second plateau is associated with the interference of electrons that do and that do not rescatter.
Paulus
GG
Max-Planck-Institut fur Quantenoptik, 85748 Garching, Germany.
Grasbon
F
Dreischuh
A
Walther
H
Kopold
R
Becker
W