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Springer eBooks

Highly Excited Barium Rydberg Atoms in External Electric, Magnetic, and Combined Fields

Herbert H. Rinneberg, Jörg Neukammer, M. Kohl, Andreas Sebastian Konig, K. Vietzke, H. Hieronymus, H. -J. Grabka

Published Jan 1, 1988• 0 citations
Publisher
DOI
10.1007/978-1-4613-1061-7_18

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We have observed barium Rydberg states with principal quantum numbers up to n=520n=520n=520. Such highly excited states allow quantitative in situ measurements of small electric fields on the order of tens of microvolts per centimeter. Because of the effective suppression of stray electric fields we have observed quasi-Landau resonances in external magnetic fields on the order of tens of gauss. The energy dependence of the spacing between neighboring quasi-Landau resonances was found to be in excellent agreement with calculations involving classical trajectories.
We report recent experimental developments in the study of high-lying Rydberg states of atomic barium in crossed external electric and magnetic fields. By employing a new, high resolution, pulsed laser system in conjunction with the experimental geometry we have previously used, we have been able to extend our investigations closer to the semiclassical limit. We have compiled Stark maps which clearly indicate changes in dynamics that take place as the electric field strength is increased for a fixed magnetic field strength of 1 T. We comment on these changes and draw comparisons with those observed previously at lower principal quantum number, lower spectral resolution and higher magnetic field strength.