Showing papers by "Marc J. J. Vrakking published in 2003"
TL;DR: It is demonstrated that the relative phase of the harmonics is encoded both in the photoelectron yield and the angular distribution as a function of XUV-IR time delay, thus making the technique suitable for the detection of single attosecond pulses.
Abstract: We report experiments on the characterization of a train of attosecond pulses obtained by high- harmonic generation, using mixed-color (XUVIR) atomic two-photon ionization and electron detection on a velocity map imaging detector. We demonstrate that the relative phase of the harmonics is encoded both in the photoelectron yield and the angular distribution as a function of XUV-IR time delay, thus making the technique suitable for the detection of single attosecond pulses. The timing of the attosecond pulse with respect to the field oscillation of the driving laser critically depends on the target gas used to generate the harmonics.
96 citations
TL;DR: In this paper, the Coulomb explosion of I2 in an intense laser field is optimized using a simple genetic algorithm and a classical model for Coulomb process, with a time-separation determined by enhanced ionization at the critical internuclear distance.
Abstract: We present calculated results for the optimization highly-charged fragment ion formation in the Coulomb explosion of I2 in an intense laser field. Calculations are performed using a simple genetic algorithm and a classical model for the Coulomb explosion process. We find that at low intensity the production of highly-charged fragment ions is optimized by a Fourier-limited pulse, whereas at higher intensity the Coulomb explosion is optimized by a sequence of pulses, with a time-separation determined by enhanced ionization at the critical internuclear distance. Our calculations provide insight into the sensitivity of adaptive pulse shaping experiments to the parameters and evolutionary approaches used.
1 citations