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 ?
[11] National Bureau of Standards (January 1949) The Atomic Clock: An Atomic Standard of Frequency and Time.
[26] Essen L, Parry J (August 1955) An atomic standard of frequency and time interval: A caesium resonator.
The atomic standard of [[blank].sup.15]N ([N.sub.2]; 0.3663 atom%) was used as reference for calculations of excess [[blank].sup.15]N.
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.264).
"It would be nice to have some atomic standard of mass" that would be independent of any particular object, Taylor says.
Besides, having three Hydrogen masers, three Cs-beam atomic standards, three cryogenic sapphire oscillators, common-view GPS and a TWSTFT microwave station, all installed and operational, our lab is the second "time" installation in France.
Mancini, "Precision Frequency Generation Utilizing OCXO and Rubidium Atomic Standards with Applications for Commercial, Space, Military, and Challenging Environments," IEEE Long Island Chapter, 2004
The thing about light is that by atomic standards it's really very large.
Parker, head of NIST's atomic standards group, which includes Jefferts' team.
Our system incorporates the exceptional performance of Frequencys rubidium atomic standards and Low G sensitivity technology together with FEI-Zyfers expertise in GPS and timing solutions for secure communications.
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.sup.-8].
While a variety of methods have been used to servo-control a local oscillator to the atomic resonance, most modern atomic standards now use square-wave modulation and digital processing to achieve the lock.