Properties of the hydrogen maser and details of the apparatus are discussed. Experimental work is described which yields a new value for the hyperfine separation of hydrogen in its ground state. The result is Δ ν =1,420,405,762±4cps. This result is based on a value of the hyperfine separation in Cs 133 which is taken to be Δ ν (Cs 133 )=9,192,631,840cps.
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Kleppner et al. (1962) studied this question.
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