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ytterbium atoms

NIST Ytterbium Atomic Clocks Set Record for Stability

by National Institute of Standards and Technology
A pair of experimental atomic clocks based on ytterbium atoms at the National Institute of Standards and Technology (NIST) has set a new record for stability. The clocks act like 21st-century pendulums or metronomes that could swing back and forth with perfect timing for a period comparable to the age of the universe.