Abstract

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

Δν=1,420,405,762±4cps.

This result is based on a value of the hyperfine separation in Cs133 which is taken to be

Δν(Cs133)=9,192,631,840cps.

© 1962 Optical Society of America

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