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Acta Physica Sinica

Experimental investigation of Stark effect of ultra-cold 39D cesium Rydberg atoms

Xingbo Zhu, Hao Zhang, Zhigang Feng, Linjie Zhang, Changyong Li, Jianming Zhao, Jia Suo-Tang, 山西大学物理电子工程学院,量子光学与光量子器件国家重点实验室,太原 030006

Published Jan 1, 2010• 10 citations
Publisher

Abstract

In this paper, we investigate the Stark effect of ultra-cold 39D cesium Rydberg atoms in low-field. The Stark structure of 39D Rydberg states is calculated numerically. The cold cesium atoms are excited to Rydberg states via two-step process and the Stark spectra are obtained by field-ionization method. The scalar and tenson polarizabilities of 39D cesium Rydberg atoms are measured to be α5/22=62(7) MHz·V-2cm2，α5/20=－146(13) MHz·V-2cm2, α3/22=73(6) MHz·V-2cm2，α3/20=－106(20) MHz·V-2cm2 respectively. The experimental values are in agreement with the theoretical results.

DOI
10.7498/aps.59.2401

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In this paper, we investigate the Stark effect of ultra-cold 39D cesium Rydberg atoms in low-field. The Stark structure of 39D Rydberg states is calculated numerically. The cold cesium atoms are excited to Rydberg states via two-step process and the Stark spectra are obtained by field-ionization method. The scalar and tenson polarizabilities of 39D cesium Rydberg atoms are measured to be α5/22=62(7) MHz·V-2cm2，α5/20=－146(13) MHz·V-2cm2, α3/22=73(6) MHz·V-2cm2，α3/20=－106(20) MHz·V-2cm2 respectively. The experimental values are in agreement with the theoretical results.
Abstract We present precise measurements of polarizabilities of cesium nS1/2 (n = 65–75) Rydberg states by Stark spectroscopies. In experiment, Rydberg atoms are excited via a two-photon scheme of a standard magneto-optical trap and detected by the field ionization technique. The Stark shift is measured by analysing the spectroscopy under an external electric field. The polarizability, α, is acquired by fitting the experimental data of Stark shifts with Δ W = − 1 2 α E 2 . The theoretical model is applied to numerically simulate the Stark map and corresponding level shifts, related deviation between the experimental measurements and calculations are less than 2%. The scaling law of polarizabilities, A ⋅ ( n * ) 7 + B ⋅ ( n * ) 6 (n* is effective principal quantum number), is attained, that shows a good agreement with the measurements.
The Stark structure of the cesium atom is calculated using parametric model potential, up-to-date quantum defects, and the same phase convention as that of conventional hydrogen. Using this phase convention makes the phase comparison between other atoms and the hydrogen atom more convenient. Experimental works are performed in an ultracold gas. The calculated Stark structures of the cesium atom for n =19 and 50D are in good agreement with our experimental results. The calculated transition probabilities for the Stark states near the n =19 are in good agreement with our observed spectra. The polarizabilities of the 50D components are measured and discussed in detail.
The Stark structures in a cesium atom around n = 18 are numerically calculated. The results show that the components of 20D states with a small azimuthal quantum number | m | shift upward a lot, and those with a large | m | shift downward a little within 1100 V/cm. All components of P states shift downward. Experimental work has been performed in ultracold atomic cesium. Atoms initially in 6P 3/2 state are excited to high- n Rydberg states by a polarization light perpendicular to the field, and Stark spectra with | m | = 1/2, 3/2, 5/2 are simultaneously observed with a large linewidth for the first time. The observed spectra are analyzed in detail. The relative transition probability is calculated. The experimental results are in good agreement with our numerical computation.
The results of experimental and theoretical investigations of the fine structure of the spectrum of the microwave transition 37 P -37 S in sodium Rydberg atoms in a weak electric field are reported. New data are obtained on the experimental values of the scalar and tensor polarizabilities of the 37 P level. A numerical simulation of the Stark diagram, taking into account the influence of the anticrossings of the Rydberg levels, is performed, and the results are found to be in good agreement with experiment.