Berlin 2005 – wissenschaftliches Programm

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A: Atomphysik

A 16: Atomic Clusters and Cold Atoms II

A 16.7: Fachvortrag

Mittwoch, 9. März 2005, 11:45–12:00, HU 3075

Attosecond measurement and control of electronic motion — •K. O’Keeffe, M. Kitzler, and M. Lezius — Photonics Institute, Vienna Technical University, Gusshausstr. 27/387, Vienna, 1040 AUSTRIA

Control over the absolute phase between the carrier and the envelope of a laser pulse creates sufficient temporal precision to enter the attosecond domain. This temporal precision is based on the fact that in few cycle fields atoms preferentially ionize within an attosecond time window: Electrons are liberated with “attosecond” precision. Recent Stereo-ATI measurements [1] have proven that electrons are preferentially ejected into distinct solid angles, depending on the phase. Momentum transfer of the returning electron onto the remaining ion core was also measured [2]. For future attosecond experiments such rescattering processes are an interesting subject. Typical rescattering scenarios contain most of the necessary ingredients to trace back the trajectories of electrons. Control over the motion of attosecond wavepakets asks for precision control over laser fields, which is optically feasible. Measurement of electron motion, however, asks for a complete diagnostic of the momentum transfer during rescattering. This is possible using momentum microscopy (COLTRIMS). We will demonstrate that we have developed the necessary tools for attosecond measurement and control.

[1] G.G. Paulus et al., Phys. Rev. Letters 91(25) 253004 (2003)

[2] X. Liu et al.,Phys. Rev. Letters, in print (2004)