Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Comparing Room Temperature and Cryogenic Cesium Fountains

Published

Author(s)

Steven R. Jefferts, Thomas P. Heavner, Thomas E. Parker, Jon H. Shirley, Elizabeth A. Donley, Filippo Levi, Davide Calonico, C Calosso, Giovanni Costanzo, B. Mongino

Abstract

We have compared the frequency of a room temperature cesium fountain primary frequency standard with that of a cryogenic (~80K) cesium fountain. This comparison yields a measurement of the blackbody frequency shift of the room temperature fountain.
Proceedings Title
Proceedings of the 2011 Joint IEEE International Frequency Control Symposium and European Frequency and Time Forum
Conference Dates
May 1-5, 2011
Conference Location
San Francisco, CA

Keywords

Blackbody Radiation Shift, Cesium Fountain, Primary Frequency Standard
Created July 31, 2011, Updated February 19, 2017