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A: Fachverband Atomphysik

A 17: Rydberg atoms

A 17.4: Vortrag

Dienstag, 7. März 2017, 15:15–15:30, N 3

Ionization spectra of highly Stark shifted Rubidium Rydberg states — •Jens Grimmel, Markus Stecker, Manuel Kaiser, Lara Torralbo-Kampo, Andreas Günther, and József Fortágh — Center for Quantum Science, Physikalisches Institut, Universität Tübingen, Germany

Rydberg atoms are extremely sensitive to electric fields and consequently have a rich Stark spectrum. At sufficiently high electric fields these states start to ionize due to tunneling through the potential barrier as well as direct coupling to the continuum. This region is of particular interest for tailoring the ionization process to certain needs, for example in order to create cold ions and electrons for microscopy applications.

In our previous work, we calculated Stark maps including the transition strength from low lying states to Stark shifted Rydberg states [1]. By adding a complex absorbing potential (CAP), we are now able to accurately predict the ionization spectra of Rydberg states beyond the classical ionization threshold. The CAP is adjusted to the external electric field, which allows us to calculate a whole range of the spectrum with only one free parameter. The results from these calculations are compared to experimental data of Stark maps for Rubidium Rydberg atoms with principal quantum numbers up to 70.

[1] J. Grimmel, M. Mack, F. Karlewski, F. Jessen, M. Reinschmidt, N. Sándor and J. Fortágh, N. J. Phys. 17, 053005 (2015).