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Improved estimate of the collisional frequency shift in Al$^+$ optical clocks
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abstract
Collisions between background gas particles and the trapped ion in an atomic clock can subtly shift the frequency of the clock transition. The uncertainty in the correction for this effect makes a significant contribution to the total systematic uncertainty budget of trapped-ion clocks. Using a non-perturbative analytic framework that was developed for this problem, we estimate the frequency shift in Al$^+$ ion clocks due to collisions with helium and hydrogen. Our calculations significantly improve the uncertainties in the collisional shift coefficients, and show that the collisional frequency shifts for Al$^+$ are zero to within uncertainty.
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Cited by 1 Pith paper
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Interactions and charge transfer dynamics of an Al$^+$ ion immersed in ultracold Rb and Sr atoms
First ab initio potentials, transition dipoles, and scattering rates for Al+ with Rb and Sr predict slow radiative charge transfer and molecular ion formation, with branching ratios favoring the ground molecular state.
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