Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 1: COLTRIMS-based Collision Physics (exchanged with A4)

A 1.2: Hauptvortrag

Montag, 8. März 2010, 14:30–15:00, F 303

Strong Field Dynamics Studied with Ion and Electron Momentum Imaging — •Lewis Cocke, Dipanwita Ray, Sankar De, Wei Cao, Guillaume Laurent, ChiiDong Lin, AT Le, Zhangjin Chen, Feng He, and Uwe Thumm — J.R.Macdonald Laboratory, Kansas State University, Manhattan,KS, USA

Some applications of momentum imaging of electrons and ions (Cold Target Recoil Ion Momentum Spectroscopy/Reaction Microcsope/Velocity Map Imaging) to problems in the interaction of short intense laser pulses with atoms and light molecules will be discussed. Examples include:

(1) Diffraction patterns characteristic of the elastic scattering of free electrons from singly ionized atoms are seen in the backscattering plateau of electrons ejected by intense lasers from rare-gas atoms. These can be analyzed in terms of the QRS (Quantitative Rescattering) model of Lin et al.

(2) The asymmetric dissociation of molecular deuterium by the combined action of a short EUV attosecond pulse train in the presence of a weak infrared field is observed when only one attosecond pulse per IR cycle is used.

(3) The dissociation of CO through autoionizing states of the cation is modified by the addition of an infrared field to the EUV attosecond pulse train which initially ionizes/excited the molecule.