Darmstadt 2008 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 1: Attosecond electron dynamics

A 1.2: Vortrag

Montag, 10. März 2008, 14:30–14:45, 3C

Attosecond time resolved momentum spectroscopy — •Ram Gopal, Konstantinos Simeonidis, Claus Dieter Schröter, Helga Rietz, and Joachim Ullrich — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Electronic response times for outer-shell electrons in atoms or molecules, lie in the domain of tens to hundreds of attoseconds and are not accessible with ’conventional’ ultra-fast laser technology, since the wavelength of visible lasers limits the pulse length to about 4 fs. Thus, attosecond pulses are required, successfully developed via high-harmonic generation (HHG) within the last five years and demonstrated to be able to trace electronic response times [1].We use ultrashort XUV pulses, typically hundreds of attoseconds long, to launch electronic wavepackets in atoms. Time delayed infrared pulses of moderate intensities(10¹³ to 10¹⁴ W/cm²) probe the excited atoms by ionisation. In conjunction with 3D ion-electron coincidence momentum imaging of the products using a ’Reaction Microscope’[2], we setup a technique for the time-resolved observation of electronic dynamics.

[1] M. Uiberacker et. al., Nature, 446 627 (2007)

[2] J. Ullrich et al., Rep. Prog. Phys 66, 1463-1545 (2003).