Hamburg 2009 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 22: Attosecond Physics II
A 22.3: Vortrag
Mittwoch, 4. März 2009, 17:15–17:30, VMP 8 R208
Attosecond Pump-Probe Experiments with a Reaction Microscope — •Helga Rietz, Konstantinos Simeonidis, Ram Gopal, and Joachim Ullrich — Max-Planck-Insitut für Kernphysik, Heidelberg
An experiment combining an attosecond light source based on high harmonic generation (HHG) in Argon with an electron and recoil ion spectrometer, a so called reaction microscope, is presented. The experiment aims at performing pump-probe-measurements with attosecond time resolution on atoms and small molecules. One future goal is to take previous work from our insitute, where the vibrational motion of the nuclear wave packet in H2+ and D2+ was observed with femtosecond resolution, to the next level.
The harmonics are generated with a commercially available Ti:Sapphire amplifier delivering laser pulses with 25 fs duration at a wavelength of 800 nm and approximately 1 mJ pulse energy. The repetition rate can be varied between 3 and 10 kHz. Further compression of the pulses is achieved via spectral broadening through self phase modulation (SPM). The HHG-source yields photon fluxes of typically 109 photons per second and harmonic order for the plateau region of the VUV-spectrum, where the cutoff is observed at approximately 40 eV for Argon. The whole setup including pump-probe optics and the HHG-target is housed in a novel vacuum chamber to meet the challenging demands for stability set by the goal to achieve attosecond time resolution.