Tara Cubel Liebisch

Probing an Electron Scattering Resonance using Rydberg Molecules within a Dense and Ultracold Gas

We present spectroscopy of a single Rydberg atom excited within a Bose-Einstein condensate. We not only observe the density shift as discovered by Amaldi and Segrè in 1934 [1], but a line shape which changes with the principal quantum number n. The line broadening depends precisely on the interaction potential energy curves of the Rydberg electron with the neutral atom perturbers. In particular, we show the relevance of the triplet p-wave shape resonance in the e--Rb(5S) scattering, which significantly modifies the interaction potential. With a peak density of 5.5×1014 cm-3, and therefore an inter-particle spacing of 1300 a0 within a Bose-Einstein condensate, the potential energy curves can be probed at these Rydberg ion neutral atom separations. We present a simple microscopic model for the spectroscopic line shape by treating the atoms overlapped with the Rydberg orbit as zero-velocity, uncorrelated, point-like particles, with binding energies associated with their ion-neutral separation, and good agreement is found.We present spectroscopy of a single Rydberg atom excited within a Bose-Einstein condensate. We not only observe the density shift as discovered by Amaldi and Segrè in 1934, but a line shape that changes with the principal quantum number n. The line broadening depends precisely on the interaction potential energy curves of the Rydberg electron with the neutral atom perturbers. In particular, we show the relevance of the triplet p-wave shape resonance in the e^{-}-Rb(5S) scattering, which significantly modifies the interaction potential. With a peak density of 5.5×10^{14}  cm^{-3}, and therefore an interparticle spacing of 1300 a_{0} within a Bose-Einstein condensate, the potential energy curves can be probed at these Rydberg ion-neutral atom separations. We present a simple microscopic model for the spectroscopic line shape by treating the atoms overlapped with the Rydberg orbit as zero-velocity, uncorrelated, pointlike particles, with binding energies associated with their ion-neutral separation, and good agreement is found.

Ultracold Chemical Reactions of a Single Rydberg Atom in a Dense Gas

Within a dense environment (

Controlling Rydberg atom excitations in dense background gases

\rho \approx 10^{14}\,

A Rydberg impurity in a dense background gas(Conference Presentation)

atoms/cm

Chip-scale atomic devices: precision atomic instruments based on MEMS

^3

Probing a quantum gas with single Rydberg atoms

) at ultracold temperatures (

Observation of mixing between singlet and triplet scattering channels in Rb

T 140

_2

compared to

Rydberg molecules

1\,\mu\text{s}

Ultracold chemistry of a single Rydberg atom in a BEC

at