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2016-07-04T00:00:00.000Z

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Wrong John Prestage?

Dr. John D. Prestage

Senior Research Scientist

JPL (NASA's Jet Propulsion Laboratory)

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JPL (NASA's Jet Propulsion Laboratory)

Background Information

Employment History

Organizing Committee

Web References (22 Total References)


APS Topical Group on Precision Measurement and Fundamental Constants - Executive Committee

positron.aps.org [cached]

John D. Prestage (2003)JPL 298-104


John Prestage, ...

www.ifcs-eftf2011.org [cached]

John Prestage, JPL/NASA


Best-in-Space: News: NASA-Built Atomic Clock Does the Time Warp, Again

www.best-in-space.com [cached]

"Atomic ions colliding with this sort of 'wall' are disturbed about 10,000 times less than in glass cell-based atomic clocks," said Dr. John Prestage of the JPL Quantum Sciences and Technology Group.


Astronomy Online Pty. Limited - Home

www.binocular.com.au [cached]

based atomic clocks," said Dr. John Prestage of the JPL Quantum Sciences and Technology Group.


Spaceflight Now | Breaking News | NASA-built atomic clock does the time warp, again

www.spaceflightnow.com [cached]

"Atomic ions colliding with this sort of 'wall' are disturbed about 10,000 times less than in glass cell-based atomic clocks," said Dr. John Prestage of the JPL Quantum Sciences and Technology Group.Because the mercury ions have a positive charge, they can be held with oscillating electric fields in a container produced with metallic electrodes inside an ultra-high vacuum system, and made into a clock.

Like all clocks, atomic clocks measure frequency of a recurring event to keep time.A wonder of quantum mechanics that govern the world of atoms is that every isolated atom in the universe is exactly the same as every other atom of the same element and containing the same number of neutrons.Atomic clocks have unique measurement capability because every atom or ion in the clock is quantum-mechanically identical to every other one.Therefore, by measuring the transition of atoms as they move back and forth between two energy levels, atomic clocks provide an absolute reference for frequency and time.

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