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Bulletin of the American Physical Society

Preparation for Acceleration and Deceleration of Cold Rydberg Atoms in the Field of a Charged Wire

Anne L. Goodsell, Poomirat Nawarat, W. C. Harper

Published Jun 9, 2015• 0 citations
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Hydrogen atoms in a cold supersonic expansion with an average velocity of 700 m s −1 have been excited to Rydberg Stark states with principal quantum number in the range n = 20–25 and subsequently decelerated and accelerated in time-independent inhomogeneous electric fields. Accelerations of up to 2 × 10 8 m s −2 have been achieved and the initial kinetic energy of atoms prepared in low (high)-field seeking Stark states could be more than quadrupled (halved) over a flight distance of only 3 mm and in a time of less than 5 µs. The control over the velocity of the Rydberg atoms is such that trapping can be envisaged.
Argon atoms in a pulsed supersonic expansion are prepared in selected Stark components of Rydberg states with effective principal quantum number in the range n * = 15–25. When traversing regions of inhomogeneous electric fields, these atoms get accelerated or decelerated depending on whether the Stark states are low- or high-field seeking states. Using a compact electrode design, which enables the application of highly inhomogeneous and time-dependent electric fields, the Rydberg atoms experience kinetic energy changes of up to 1.2 × 10 −21 J (i.e. 60 cm −1 in spectroscopic units) in a single acceleration/deceleration stage of 3 mm length. The resulting differences in the velocities of the low- and high-field seeking states are large enough that the corresponding distributions of times of flight to the Rydberg particle detector are fully separated. As a result, efficient spectral searches of the Rydberg states best suited for acceleration/deceleration experiments are possible. Numerical simulations of the particle trajectories are used to analyse the time-of-flight distributions and to optimize the time dependence of the inhomogeneous electric fields. The decay of the Rydberg states by fluorescence, collisions and transitions induced by black-body radiation takes place on a timescale long enough not to interfere significantly with the deceleration during the first ∼5 µs.