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A: Atomphysik

A 20: Poster II: Atomare Systeme in starken Laserpulsen und statischen Feldern

A 20.16: Poster

Donnerstag, 16. März 2006, 16:30–18:30, Labsaal

Ionisation and recombination in atto-second electric field pulses — •Julian Poloczek, Darko Dimitrovski, and John S. Briggs — Theoretische Quantendynamik, Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg

We study ionisation and excitation of a hydrogenic atom from the ground and first excited states in short electric field pulses of several cycles. A process of ionisation and recombination which occurs periodically in time is identified, both for small and extremely large peak electric field strengths. In the limit of large electric peak fields closed-form analytic expressions for the population of the initial state after single- and few-cycles pulses are derived. These formulae, strictly valid for asymptotically large momentum transfer from the field, give an excellent agreement with the fully numerical calculations for all momentum transfers.