atomic standard

atomic standard

[ə′täm·ik ′stan·dərd]
(physics)
Any supposedly immutable property of an atom, such as the wavelength or frequency of a characteristic spectral line, in terms of which a unit of a physical quantity is defined.
References in periodicals archive ?
These improved mass measurements may also contribute to an ongoing effort to produce an atomic standard for mass, replacing the platinum-iridium cylinder currently representing a kilogram (SN: 4/24/93, p.
A ruggedized Rubidium atomic standard for challenging environments to upgrade existing and new military platforms.
It would be nice to have some atomic standard of mass" that would be independent of any particular object, Taylor says.
Results of this activity are expected to augment the company's revenues and backlog in the next fiscal year, and we anticipate that sales of FEI's Commercial Rubidium Atomic Standard will add to this growth.
Rubidium atomic standards are accurate to within 1 second in 100,000 years, where the best crystal oscillators are accurate to 1 second in a few thousands years.
At the beginning of this early period of development of atomic frequency standards, both quartz and atomic standards were achieving frequency uncertainties of about 2 X [10.
Parker, head of NIST's atomic standards group, which includes Jefferts' team.
Nasdaq: DATM) today announced its Frequency and Time Systems division, of Beverly, MA has been selected to supply precision cesium atomic standards for the Federal Aviation Autbority's (FAA) Wide Area Augmentation System (WAAS) for civil aircraft navigation.
Called the Global Positioning System, or NAVSTAR, it provides extremely high accuracy reference signals that are based upon atomic standards.
These atomic standards are essential for a broad array of applications including systems for telecommunications, metrology, as well as space, defense and avionics.
Symmetricom's Timing, Test and Measurement Division is structured to support three primary business initiatives: Space Defense and Avionics (SDA), Time & Frequency Solutions, including GPS instrumentation, bus level cards and atomic standards, and IP network-based time servers and products for enterprise markets.