1972/02/01 by D. J. Wineland, Norman F. Ramsey · 5 citations
Physics and Astronomy · #Advanced Frequency and Time Standards #Astrophysics #Atomic and Molecular Physics #Atomic physics #Cold Atom Physics and Bose-Einstein Condensates #Deuterium #Frequency shift #Ground state #Hydrogen maser #Hyperfine structure #Maser #Optics #Physics
paper · doi:10.1103/physreva.5.821
openalex publication_date 1972/02/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
An atomic deuterium maser operating on hyperfine transitions was used to measure the ground-state hyperfine separation in deuterium. The result was \ensuremathν0(D)=327 384 352.5222(17) Hz where the hydrogen hyperfine frequency is assumed to be exactly 1420 405 751. 768 Hz. The construction of the device is discussed and a theory of the deuterium maser is presented with special attention given to frequency shifts occurring in the output frequency. In addition, a possible shift of the deuteron Larmor frequency because of the earth's gravitational field was also investigated and found to be 10^\ensuremath-4 Hz.