Calculation of polarizabilities of low-lying states of Ag
ORAL
Abstract
The transition-metal silver atom has recently begun to attract increased attention from theo-
rists and experimentalists. For example, atomic silver can be used in optical lattice clocks using
the electric quadrupole 4d105s 2S1/2 − 4d95s2 2D5/2 transition as a clock transition. One of the
other interesting features of silver is its ability to form ultracold, highly polar diatomic molecules
containing the silver atom (in its ground state) interacting with a noble gas, an alkali-metal or an
alkaline-earth-metal atom.
To support the experimental efforts, we calculated the dc and ac polarizabilities (at the wave-
lengths 532 nm and 1064 nm convenient for laser trapping) for the lowest-lying even and odd-parity
states of Ag. A specific feature of the Ag atom is that along with the states belonging to the con-
figuration 4d10x (where x ≡ 5, 6s; 5, 6p, 5d, etc.), there are also low-lying states with the unfilled 4d
shell 4d95s2 2D3/2,5/2.
To calculate the properties of the 4d10x states, we used a single-electron method, such as many-
body perturbation theory (MBPT) over the residual Coulomb interaction, or using an all-order,
linearized coupled-cluster single-double (LCCSD) method. For calculating the properties of the
4d95s2 2D3/2,5/2 states, a single electron approach is not applicable. In this case, we consider Ag as
an atom with many valence electrons and apply the 11- and 17-electron configuration intaction (CI) method.
rists and experimentalists. For example, atomic silver can be used in optical lattice clocks using
the electric quadrupole 4d105s 2S1/2 − 4d95s2 2D5/2 transition as a clock transition. One of the
other interesting features of silver is its ability to form ultracold, highly polar diatomic molecules
containing the silver atom (in its ground state) interacting with a noble gas, an alkali-metal or an
alkaline-earth-metal atom.
To support the experimental efforts, we calculated the dc and ac polarizabilities (at the wave-
lengths 532 nm and 1064 nm convenient for laser trapping) for the lowest-lying even and odd-parity
states of Ag. A specific feature of the Ag atom is that along with the states belonging to the con-
figuration 4d10x (where x ≡ 5, 6s; 5, 6p, 5d, etc.), there are also low-lying states with the unfilled 4d
shell 4d95s2 2D3/2,5/2.
To calculate the properties of the 4d10x states, we used a single-electron method, such as many-
body perturbation theory (MBPT) over the residual Coulomb interaction, or using an all-order,
linearized coupled-cluster single-double (LCCSD) method. For calculating the properties of the
4d95s2 2D3/2,5/2 states, a single electron approach is not applicable. In this case, we consider Ag as
an atom with many valence electrons and apply the 11- and 17-electron configuration intaction (CI) method.
*This work is part of the "Thorium Nuclear Clock" project that has received funding from the European Research Council under the European Union's Horizon 2020 research and innovation program (Grant No. 856415). The calculations in this work were done through the use of Information Technologies resources at the University of Delaware, specifically the high-performance Caviness and DARWIN computer clusters. This work was supported by National Science Foundation Grants No. PHY-2110102, No. PHY-2309254, and Office of Naval Research Grants No. N00014-22-1-2070 and N00014-20-1-2513.
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Presenters
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Dmytro Filin
- University of Delaware