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Dr. Yuri Ralchenko is a leading researcher at NIST’s Atomic Spectroscopy Group, focusing on highly-charged ions, plasma modeling,

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This article explains how the second, the SI unit of time, is defined based on the vibrations of

Daniel Jardin | NIST

Dr. Dan Jardin is a physicist at NIST working on neutron detection and measurement. His current projects include

Time & frequency | NIST

NIST, the National Institute of Standards and Technology, plays a crucial role in time and frequency measurement, which

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