Purines and pyrimidines: clinical and analytical aspects
The idea of using the resonance properties of an ensemble of isolated atoms (i.e. in a vapour) to realise a frequency standard and a clock is attributed to I.I. Rabi, in 1939 (Nobel prize 1944). The first atomic clock was built at the National Bureau of Standards (NBS) during 1948-49, using a microwave absorption line … ................
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