Correlated Two-Electron Momentum Spectra for Strong-Field Nonsequential Double Ionization of He at 800 nm
Abstract
We report on a kinematically complete experiment on nonsequential double ionization of He by 25 fs 800 nm laser pulses at 1.5PW/cm2. The suppression of the recollision-induced excitation at this high intensity allows us to address in a clean way direct (e,2e) ionization by the recolliding electron. In contrast with earlier experimental results, but in agreement with various theoretical predictions, the two-electron momentum distributions along the laser polarization axis exhibit a pronounced V-shaped structure, which can be explained by the role of Coulomb repulsion and typical (e,2e) kinematics.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 2007
- DOI:
- 10.1103/PhysRevLett.99.263003
- Bibcode:
- 2007PhRvL..99z3003R
- Keywords:
-
- 32.80.Rm;
- 32.80.Fb;
- Multiphoton ionization and excitation to highly excited states;
- Photoionization of atoms and ions