ABSTRACT We describe a situation where a varying collisional frequency shift in cesium fountain primary frequency standards can be misinterpreted as a power-dependent shift. This misinterpretation may affect analyses of fountains test-operated at multiple π/2 microwave pulse areas. Such tests are typically performed in the search for microwave- and cavity-related systematic frequency biases.
Digital Object Identifier 10.1109/TUFFC.2007.455
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