ammonia clock

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ammonia clock

n
(Horology) an atomic clock based on the frequency of inversion of the ammonia molecule
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Noun1.ammonia clock - an atomic clock based on vibrational frequency of the nitrogen atom in the ammonia molecule
atomic clock - a timepiece that derives its time scale from the vibration of atoms or molecules
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References in periodicals archive
A final technical obstacle faced by Lyons was his quest to make his ammonia clock more accurate by increasing the quality factor, Q, as previously discussed and shown in Eq.
He quickly learned from these measurements that the potential accuracy of the ammonia clock was limited.
newspapers, credited Lyons with the invention of the atomic clock in 1953, but the drawing was not of the ammonia clock, but rather of the cesium beam clock that would later become NBS-1 (Fig.
A Historical Review of U.S. Contributions to the Atomic Redefinition of the SI Second in 1967
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