Above-threshold ionization at the few-cycle limit.
Photoelectron spectra measured for rare-gas atoms ionized with intense few-cycle laser pulses are presented. Several aspects of the few-cycle regime are discussed. In particular, the persistence of the plateaulike structure of spectra for high electron energies is shown. In contrast, a resonancelike feature at similar electron energies is suppressed as compared with longer laser pulses. Differences in the behavior of different species and implications for the electron-ion scattering cross section are pointed out.
Grasbon
F
F
Max-Planck-Institute for Quantum Optics, 85748 Garching, Germany.
Paulus
G G
GG
Walther
H
H
Villoresi
P
P
Sansone
G
G
Stagira
S
S
Nisoli
M
M
De Silvestri
S
S