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Chinese Physics Letters

Tune-Out Wavelengths for the Rb Atom

Wei-Wei Yu, Rongmei Yu, Yongjun Cheng

Published Dec 1, 2015• 5 citations
Publisher

Abstract

The five longest tune-out wavelengths for the rubidium atom are predicted from existing experimental and theoretical information by using an approximation formula. The formula is derived from the analysis of a non-relativistic configuration-interaction plus core polarization (CICP) calculation of the tune-out wavelengths for rubidium. The differences between the wavelengths predicted from the approximation formula and the exact CICP calculation are at the 10 −3 nm level. The predicted five longest tune-out wavelengths are 790.115 nm, 423.155 nm, 421.111 nm, 359.429 nm, and 359.022 nm, respectively.

DOI
10.1088/0256-307x/32/12/123102

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The five longest tune-out wavelengths for the rubidium atom are predicted from existing experimental and theoretical information by using an approximation formula. The formula is derived from the analysis of a non-relativistic configuration-interaction plus core polarization (CICP) calculation of the tune-out wavelengths for rubidium. The differences between the wavelengths predicted from the approximation formula and the exact CICP calculation are at the 10 −3 nm level. The predicted five longest tune-out wavelengths are 790.115 nm, 423.155 nm, 421.111 nm, 359.429 nm, and 359.022 nm, respectively.
The static and dynamic polarizabilities and the tune-out wavelengths of the ground state of Rb and the hyperfine ground states of 87,85Rb^{87,85}\mathrm{Rb}87,85Rb have been calculated by using the relativistic configuration interaction plus core polarization (RCICP) approach. It is found that the first primary tune-out wavelengths of the 5s1/2,F=1,25{s}_{1/2},F=1,25s1/2​,F=1,2 states of 87Rb^{87}\mathrm{Rb}87Rb are 790.018187(193) and 790.032602(193) nm, respectively, where the calculated result for the 5s1/2,F=25{s}_{1/2},F=25s1/2​,F=2 state is in good agreement with the latest high-precision measurement 790.032388(32) nm [R. H. Leonard et al., Phys. Rev. A 92, 052501 (2015)]. Similarly, the first primary tune-out wavelengths of the 5s1/2,F=2,35{s}_{1/2},F=2,35s1/2​,F=2,3 states of 85Rb^{85}\mathrm{Rb}85Rb are 790.023515(218) and 790.029918(218) nm, respectively. Furthermore, the tune-out wavelengths for the different magnetic sublevels MF{M}_{F}MF​ of each hyperfine level FFF are also determined by considering the contributions of tensor polarizabilities.
The five longest tune-out wavelengths for the potassium atom are determined using a relativistic structure model which treats the atom as consisting of a single valence electron moving outside a closed shell core. The importance of various terms in the dynamic polarizability in the vicinity of the 4pJ4{p}_{J}4pJ​, 5pJ5{p}_{J}5pJ​, and 6pJ6{p}_{J}6pJ​ transitions are discussed.
We report the theoretical prediction and measurement of a tune-out wavelength for the ground state of the thulium atom in a linearly polarized optical dipole trap with a wavelength of approximately 576 nm. The measurements were conducted using a combination of trap frequency and RF loss spectroscopy, thus making it possible to separate the scalar and tensor parts of the total polarizability without measurements in the range of negative total polarizability. The calculated tune-out wavelength is consistent with the measured one of 575.646−0.014+0.016575.646_{-0.014}^{+0.016}575.646−0.014+0.016​ nm in air. The existence of the zero in the polarizability for the Tm ground state was confirmed by the trap loss experiment, which also made it possible to refine the tune-out wavelength to 575.646−0.004+0.004575.646_{-0.004}^{+0.004}575.646−0.004+0.004​. Despite the presence of an imaginary part of the polarizability at some wavelengths, it was experimentally demonstrated that, with a proper choice of the dipole trap polarization, it was possible to achieve Bose-Einstein condensation of thulium atoms in the range from 575.348 to 575.689 nm, covering the tune-out wavelength.
The lowest three tune-out wavelengths of the four alkaline-earth-metal atoms Be, Mg, Ca, and Sr are determined from tabulations of matrix elements produced from large first-principles calculations. The tune-out wavelengths are located near the wavelengths for the 3P1o{}^{3}{P}_{1}^{o}3P1o​ and 1P1o{}^{1}{P}_{1}^{o}1P1o​ excitations. The measurement of the tune-out wavelengths could be used to establish a quantitative relationship between the oscillator strength of the transition leading to existence of the tune-out wavelength and the dynamic polarizability of the atom at the tune-out frequency. The longest tune-out wavelengths for Be, Mg, Ca, Sr, Ba, and Yb are 454.9813, 457.2372, 657.446, 689.200, 788.875, and 553.00 nm, respectively.
The six longest tune-out wavelengths for the He(1s2s3S1e1s2s{\phantom{\rule{4pt}{0ex}}}^{3}{S}_{1}^{e}1s2s3S1e​) metastable state are determined by explicit calculation. The tune-out wavelength at 413.02 nm is expected to be sensitive to finite mass, relativistic, and quantum electrodynamic effects upon the transition matrix elements and its measurement would provide a nonenergy test of fundamental atomic structure theory.