Chinese Physics B

Electric dipole moments of lithium atoms in Rydberg states

Hui-Jie Dong, Ke-Shu Huang, Changyong Li, Jianming Zhao, Linjie Zhang, Suotang Jia

Published Sep 1, 2014• 3 citations

Abstract

Recently, the diverse properties of Rydberg atoms, which probably arise from its large electric dipole moment (EDM), have been explored. In this paper, we report electric dipole moments along with Stark energies and charge densities of lithium Rydberg states in the presence of electric fields, calculated by matrix diagonalization. Huge electric dipole moments are discovered. In order to check the validity of the EDMs, we also use these electric dipole moments to calculate the Stark energies by numerical integration. The results agree with those calculated by matrix diagonalization.

DOI: 10.1088/1674-1056/23/9/093202

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Chinese Physics B

Electric dipole moments of lithium atoms in Rydberg states

Hui-Jie Dong, Ke-Shu Huang, Changyong Li, Jianming Zhao, Linjie Zhang, Suotang Jia

Published Sep 1, 2014• 3 citations

Publisher

Abstract

DOI: 10.1088/1674-1056/23/9/093202

Related papers

Measurement and theoretical calculation for Stark energy and electric dipole moment of Cs Rydberg state

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Adiabatic energy levels and electric dipole moments of Rydberg states of Rb2 and Cs2 dimers

A.A. Khuskivadze, M. I. Chibisov, I. I. Fabrikant

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Physical Review AOct 15, 2002117 citations

Dipole-dipole interactions between helium atoms in Rydberg-Stark states with principal quantum number

n=53

and approximately linear Stark energy shifts, resulting from induced electric dipole moments of approximately 7900 D, have been investigated experimentally. The experiments were performed in pulsed supersonic metastable helium beams, with particle number densities of up to $\ensuremath{\sim}{10}^{9}\phantom{\rule{4pt}{0ex}}{\mathrm{cm}}^{\ensuremath{-}3}$. In the presence of amplitude-modulated, radio-frequency electric fields, changes in the spectral intensity distributions associated with the transitions to these states that are attributed to dipole-dipole interactions within the ensembles of excited atoms have been observed. The experimental results are in excellent agreement with calculations of the Rydberg energy level structure carried out using Floquet methods, and excitations shared by up to four atoms. The use of these Rydberg-Stark states as sensors for nonresonant broadband radio-frequency electrical noise is also discussed.

We calculate potential energy curves for heavy alkali-metal dimers,

{\mathrm{Rb}}_{2}

and

{\mathrm{Cs}}_{2}

in which one of the atoms is in a highly excited Rydberg states. The method combines numerical integration of coupled equations, describing interaction of electron with the ground-state atom in the field of the Coulomb core of the Rydberg atom, with subsequent matching of the obtained wave function with the Coulomb Green's function in the form of the Kirchhoff integral. The spin-orbit interaction for the Rydberg electron is also included. The results show the existence of several groups of states. Most interesting of them are dominated either by the

{}^{3}S

symmetry near the ground-state atom or by the

{}^{3}{P}_{J}

symmetry,

J=0,1,2.

All states, except the

{}^{3}{P}_{1}

state, exhibit oscillatory dependence of energy on the internuclear distance that can support long-range molecular Rydberg states [e.g., ``trilobite states'' for the

{}^{3}S

symmetry, Greene et al., Phys. Rev. Lett. 85, 2458 (2000)]. These states possess large diagonal and transition dipole moments which are expressed analytically in terms of the Coulomb wave functions and calculated in a broad range of internuclear separations.