Dresden 2011 – scientific programme
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A: Fachverband Atomphysik
A 23: Ultracold Atoms: Trapping and Cooling 1 (with Q)
A 23.4: Talk
Thursday, March 17, 2011, 15:15–15:30, SCH A118
Trapping ions with lasers — •Cecilia Cormick and Giovanna Morigi — Theoretische Physik, Universität des Saarlandes, D-66041 Saarbrücken, Germany
This work theoretically addresses the physics underlying the trapping of an ionized atom with a single valence electron by means of lasers. In our model, the coupling between the ion and the electromagnetic field includes the charge monopole and the internal dipole, within a multipolar expansion of the interaction Hamiltonian. Specifically, we perform a Power-Zienau-Woolley transformation, taking into account the motion of the center of mass. The net charge produces a correction in the atomic dipole which is of order me/M with me the electron mass and M the total mass of the ion. With respect to neutral atoms, there is also an extra coupling to the laser field which can be approximated by that of the monopole located at the position of the center of mass. These additional effects, however, are shown to be very small compared to the dominant dipolar trapping term, and we can conclude that the effect of the net charge on dipolar trapping is negligible.