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Surface ionization of Rydberg states of Xenon in the presence of an external field

Jelena Sjakste, Andrei G. Borisov, J.P. Gauyacq

Published Jan 1, 2004• 0 citations
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We investigate the interaction of a xenon Rydberg atom with a metallic surface in an electric field. We also present a Stark map for xenon Rydberg atoms. The xenon Rydberg atom is modeled using a pseudopotential fitted to experimentally obtained quantum defects. We show that several xenon levels exhibit avoided crossings with the application of a DC electric field. Additional avoided crossings occur as the xenon Rydberg atom approaches a surface. These avoided crossings lead to mixing between levels of different principal quantum number n. Nonadiabatic transition through these avoided crossings can explain recent results involving ionization of state-selected xenon Rydberg atoms near a metal surface.

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Ionization of Rydberg atoms at metallic surfaces: Influence of stray fields

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The ionization of xenon Rydberg atoms at metallic surfaces is examined. The data show that, when the effects of stray electric ``patch'' fields present on the surface are taken into account, ionization is well described by a simple over-the-barrier model. The patch fields are determined from direct measurements of the potential variations across the target surfaces using Kelvin probe force microscopy. Monte Carlo techniques are used to model the atom-surface interaction. The results confirm the important role that patch fields can play during Rydberg atom-surface interactions and suggest that such interactions can provide a sensitive probe of stray fields at surfaces.

Physical Review A•Apr 30, 2010•25 citations
We investigate the interaction of a xenon Rydberg atom with a metallic surface in an electric field. We also present a Stark map for xenon Rydberg atoms. The xenon Rydberg atom is modeled using a pseudopotential fitted to experimentally obtained quantum defects. We show that several xenon levels exhibit avoided crossings with the application of a DC electric field. Additional avoided crossings occur as the xenon Rydberg atom approaches a surface. These avoided crossings lead to mixing between levels of different principal quantum number n. Nonadiabatic transition through these avoided crossings can explain recent results involving ionization of state-selected xenon Rydberg atoms near a metal surface.
The ionization of xenon Rydberg atoms at metallic surfaces is examined. The data show that, when the effects of stray electric ``patch'' fields present on the surface are taken into account, ionization is well described by a simple over-the-barrier model. The patch fields are determined from direct measurements of the potential variations across the target surfaces using Kelvin probe force microscopy. Monte Carlo techniques are used to model the atom-surface interaction. The results confirm the important role that patch fields can play during Rydberg atom-surface interactions and suggest that such interactions can provide a sensitive probe of stray fields at surfaces.