Abstract
Recently it has been shown both theoretically and experimentally that, for certain operating conditions of a caesium fountain primary frequency standard, the cold-collision frequency shift, which can be a limit to the accuracy of the standard, strongly varies with the clock state composition and can be cancelled. This offers the intriguing prospect of operating a fountain standard at the zero-shift point, where no correction for collisions needs to be applied. We estimate expected improvements in the standard’s accuracy and a potential shortening of the averaging time. Lastly, we derive relevant requirements for the key experimental parameters.
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32.80.Pj; 06.20.-f
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Szymaniec, K., Chalupczak, W., Weyers, S. et al. Prospects of operating a caesium fountain clock at zero collisional frequency shift. Appl. Phys. B 89, 187–193 (2007). https://doi.org/10.1007/s00340-007-2813-5
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DOI: https://doi.org/10.1007/s00340-007-2813-5