title: Apparent power-dependent frequency shift due to collisions in a cesium fountain.
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 pi/2 microwave pulse areas. Such tests are typically performed in the search for microwave- and cavity-related systematic frequency biases.
authors.forename: K
authors.initials: K
authors.lastname: Szymaniec
authors.forename: W
authors.initials: W
authors.lastname: Chalupczak
authors.forename: S
authors.initials: S
authors.lastname: Weyers
authors.forename: R
authors.initials: R
authors.lastname: Wynands
mesh_terms: D002586:Cesium / Q000737:chemistry*; D003198:Computer Simulation; D004735:Energy Transfer; D006207:Half-Life; D008872:Microwaves; D008962:Models, Theoretical; D009991:Oscillometry / Q000379:methods*; D013997:Time Factors
chemical_list: D002586:Cesium