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Measuring Mass in Seconds.
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- Abstract:
The article looks at a report within the issue by S.-Y. Lan and colleagues on the development of a clock which measures time based on the mass of a particle, as indicated in the theory of relativity. The device uses an atom laser interferometer and optical frequency comb to determine the Compton momentum recoil frequency of a cesium-133 atom. The interferometer signal is stabilized to a common reference oscillator to link the atom's mass to time. It is suggested that these results could be applied to more precise measurements of time, as well as a redefinition of the kilogram as a unit of mass measurement.
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