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Article: Primary atomic frequency standards at NIST.(National Institute of Standards and Technology)
- Article from:
- Journal of Research of the National Institute of Standards and Technology
- Article date:
- January 1, 2001
- Author:
CopyrightCOPYRIGHT 2001 National Institute of Standards and Technology. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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The development of atomic frequency standards at NIST is discussed and three of the key frequency-standard technologies of the current era are described. For each of these technologies, the most recent NIST implementation of the particular type of standard is described in greater detail. The best relative standard uncertainty achieved to date for a NIST frequency standard is 1.5 X [10.sup.-15]. The uncertainties of the most recent NIST standards are displayed relative to the uncertainties of atomic frequency standards of several other countries.
Key words: atomic clock; atomic frequency standard; cesium-beam frequency standard; cesium-fountain frequency standard; ...