Heidelberg 2015 – scientific programme

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A: Fachverband Atomphysik

A 33: Collisions, scattering and recombination

A 33.3: Talk

Thursday, March 26, 2015, 15:00–15:15, C/kHS

Influence of the laser field’s turn-on duration and frequency detuning on Kapitza-Dirac scattering — •Matthias M. Dellweg and Carsten Müller — Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf

Diffractive scattering of an electron beam from a standing wave of light (Kapitza-Dirac effect) is studied theoretically. The corresponding Schrödinger equation is solved by combined analytical and numerical means. We examine the roles played by the nature of the field’s turning-on phase and by a detuning of the light frequency. We demonstrate that the characteristic Rabi oscillations between the initial and scattered electron states are strongly suppressed when the turn-on of the field takes too long [1] or when the field frequency is largely detuned from the resonance (Bragg) condition. A mutual interplay between the detrimental effects of detuning and turn-on duration is revealed [2]. Also the case of very fast turn-on is considered where we show that the electron dynamics follow a scaling law with respect to an action variable.

[1] M. V. Fedorov, Opt. Commun. 12, 205 (1974)

[2] M. M. Dellweg and C. Müller, in preparation