Member of Project 2.2 "Strong-field Few-body Systems"
Our group's research focus is set on the investigation of atomic ionization dynamics in strong laser fields, where the laser intensities cover a range from 1014 W/cm2 to 1019 W/cm2. Earlier research highlights embrace results on simultaneous double tunneling, suppression of non-sequential ionization in relativistic laser fields, and core relaxation effects in relativistic laser fields. More recently, the focus of our investigations has shifted towards strong-field processes that lead to a) excited neutral atoms, b) neutral excited fragments after strong-field dissociation of molecules, and c) high survival rates of Rydberg atoms. Moreover, the survival of atoms in neutral excited states is accompanied by kinematic effects on neutral atoms in the focused laser beam, which we investigate using a direct imaging technique of excited atoms.
The figure shows the color-coded distribution of deflected (accelerated) neutral He atoms in a focused short-pulse laser beam with an intensity of 8x1015W/cm2.
- Strong-field tunneling without ionization Physical Review Letters 101 (2008) 233001/1-4
- Sympathetic cooling of laser-produced doubly charged ions in a few-ion crystal Physical Review A 75 (2007) 063418/1-6
- Multiple ionization of Kr in an intense circularly polarized laser field Journal of Physics B-Atomic, Molecular and Optical Physics 39 (2006) S381-387
- Reply: fano line shapes reconsidered: symmetric photoionization peaks from pure continuum excitation Physical Review Letters 94 (2005) 229302
- Core Relaxation in Atomic Ultra Strong Laser Field Ionization Physical Review Letters 94 (2005) 053602/1-4
- Strong laser field ionization of Kr: first-order relativistic effects defeat rescattering Journal of Physics B-Atomic, Molecular and Optical Physics 38 (2005) L87-93
- "On-line" cleaning of optical components in a multi TW-Ti:Sa laser system Vacuum 76 (2004) 45-49
- Magneto-optical trapping of Stark-slowed metastable He atoms European Physical Journal D 23 (2003) 415-419
- Photoexcitation and ionization of cold metastable helium atoms Interactions in ultracold gases: from atoms to molecules Wiley (2002) 394-398
- Was wiegt ein Elektron? Physik Journal Februar 1 (2002) 16-17