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New atomic fountain clock joins group that keeps the world on time
NIST scientists have published results establishing a new atomic clock, NIST-F4, as one of the world’s most accurate timekeepers
NIST has also submitted the clock for acceptance as a primary frequency standard by the International Bureau of Weights and Measures (BIPM), the body that oversees the world’s time. The research team took months’ worth of measurements to make sure NIST-F4 was not thrown off by factors such as pressure and temperature fluctuations or stray electric and magnetic fields. This month, the NIST team reported in the journal Metrologia that NIST-F4’s frequency measurements were accurate to within 2.2 parts in 10 to the 16th (10 million billion) — comparable to the world’s best fountain clocks.
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