Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 8: Poster I
A 8.25: Poster
Dienstag, 9. März 2010, 16:30–19:00, Lichthof
First Experiments on Quantum Dynamics with Attosecond Pulses in a Reaction Microscope — •Helga Rietz, Ram Gopal, Alexander Sperl, Konstantinos Simeonidis, and Joachim Ullrich — Max-Planck-Institut für Kernpyhsik, Heidelberg
We present the first measurements taken with the reaction microscope that has recently been installed at the attosecond beamline at Max-Planck-Institut für Kernpyhsik, Heidelberg. Combining a versatile HHG-source with a compact reaction microscope, this setup has been designed for the investigation of the electronic response in atoms and molecules.
As a first test of the assembly, we observed sidebands in electron spectra from He- and Ar-ionization that confirm the interferometric stability of the setup. These features were also used to confirm the duration of the applied IR-laser pulses. The following experiments in D2, which were carried out with laser pulses of approximately 30 fs duration, showed a clear signature of bond softening [1] in presence of the IR-field. Changing to laser pulses that were further shortened down to about 8 fs by spectral broadening in an optical fiber and a subsequent chirped mirror compressor, we observed oscillations of the vibrational nuclear wavepacket in D2+ (see Ergler et al. [2]). The successful reproduction of these features explored earlier by other researchers now allows us to move on to new experiments.
[1] P. H. Bucksbaum et al., Phys. Rev. Lett. 64, 1990
[2] Th. Ergler et al., Phys. Rev. Lett. 97, 2006