Hydrogen Maser
A Hydrogen Maser is a highly precise atomic clock that uses the hyperfine transition of hydrogen atoms to measure time. It operates by stimulating hydrogen atoms to emit microwave radiation at a specific frequency, which is then used to measure time. Hydrogen Masers are the most accurate time-keeping devices available, with an accuracy of one second in 3 million years. They are used in a variety of applications, including satellite navigation, deep space communication, and scientific research.
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