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
© 1962 Optical Society of America
Original Manuscript: July 1, 1961
Published: January 1, 1962
Daniel Kleppner, H. Mark Goldenberg, and Norman F. Ramsey, "Properties of the Hydrogen Maser," Appl. Opt. 1, 55-60 (1962)