Nonlinear Processes in Strong Fields
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'Finger'-structure in correlated electron momentum distributions
We have identified a novel finger-like structure in the correlated electron emission in strong-field double ionization. In collaboration with the experimental groups of R. Dörner (U Frankfurt, Germany) and P.B. Corkum (NRC Ottawa, Canada) we were able to relate these structures to a strong-field analogue of the recoil peak in field-free electron impact ionization. more ...
A. Staudte et al., Physical Review Letters 99 (2007) 263002 [ Extern Link Link to Journal ]
Control of electron motion in a molecular bond
It is expected that with attosecond pulses it is possible to control the motion of electrons in a molecular bond via the oscillating electric field of the laser. Our quantum mechanical simulations of the dissociation of the hydrogen molecular ion show how this can be acchieved using two laser pulses with a time delay more ...
F. He et al., Physical Review Letters 99, 083002 (2007) [ Extern Link Link to Journal ]
A virtual lab for ultrashort processes
We have developed a virtual lab which allows for the efficient analysis and visualization of ultrashort atomic and molecular processes in strong fields. It provides a numerical tool to study the few-body dynamics on an attosecond time scale more ...
All at once: Tunable, ultrashort, stable with a high beam quality
Intense ultrashort laser pulses in the infrared are a basic tool in many branches of physics and chemistry. But, what is missing are tunable high energy few-cycle coherent light sources at visible wavelengths with high beam quality and energy stability. In a collaboration with the group of See Leang Chin at the Universite Laval (Quebec, Canada) and Neset Aközbek (Huntsville, US) we have reported that these requirements can be achieved by four-wave mixing during filamentation of an intense near-infrared laser pulse. more ...
F. Theberge et al., Physical Review Letters 97, 023904 (2006) [ Extern Link Link to Journal ]
A molecular multi-slit interference effect
Observations have shown that molecules require systematically higher saturation field strengths than atoms of the same ionization potential. What obstructs the electron from leaving the molecule easily? The results of our calculations for the Buckminster fullerene suggest that it is due to a molecular multi-slit like interference effect among the electron waves emanating from the many nuclear centers of the molecule. more ...
A. Jaron-Becker et al., Physical Review Letters, 96, 143006 (2006) [ Extern Link Link to Journal ]
Topical review article featured as Highlight of 2005
Our topical review article Intense-field many-body S-matrix theory has been selected by the Editorial Board Members of Journal of Physics B as a Highlight of 2005. The article can be now freely accessed until December 2006 Extern Link here .
Summerschool: Few body dynamics in atomic and molecular systems
We co-organize an International Wilhelm and Else Heraeus Summerschool (10.-23.9.2006 at LEUCOREA, Wittenberg, Germany), which is intended to provide an introduction for PhD students and PostDocs to the fields of interaction of atoms, molecules and clusters with light fields and charged particles. Extern Link more ...
Ab-initio simulations of laser driven Helium (featured on cover of Physical Review Letters)
Computation of the quantum two-electron problem in a strong laser pulse is believed to require the use of supercomputers. We have used a simple principle based on Newton's laws to reduce the computational costs. The results of our model calculations for the laser driven Helium are in agreement with the current experimental observations. They were featured on the Extern Link cover of Physical Review Letters (issue of 10 Feb 2006). more ...
C. Ruiz et al., Physical Review Letters 96, 053001 (2006) [ Extern Link Link to Journal ]
updated by A. Becker, 01/2008