Last Update

2006-03-01T00:00:00.000Z

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Dr. John D. Prestage

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Background Information

Employment History

JPL Quantum Sciences

Member, Jet Propulsion Laboratory

NASA

Chairman

Exhibits

Chairman

Awards

National Aeronautics and Space Administration (NASA)

Web References (18 Total References)


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.


In microgravity, the atoms linger in ...

www.andhrajyothy.com [cached]

In microgravity, the atoms linger in the cavity, allowing for longer and more accurate measurements, said John Prestage of NASA's Jet Propulsion Laboratory in California. ACES should be at least 100 times as accurate as the clocks on GPS satellites, he said.


IEEE UFFC Frequency Control Home

www.ieee-uffc.org [cached]

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Astronomy Online Pty. Limited - Home

www.riflescopes.com.au [cached]

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


Techdigital.net Dedicated to space programs and sciene - NASA-BUILT atomic clock does the time warp, again

www.techdigital.net [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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