New PDF release: Atoms I / Atome I

By E. Richard Cohen, Jesse W. M. DuMond, H. A. Bethe, E. E. Salpeter (auth.)

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Sec. -1, a disagreement which, though small judged by earlier standards, is uncomfortably large relative to the claimed probable errors. The HANSEN and BOL cavity resonance measurement consisted essentially of a determination of both the wavelength (in centimeters) and the frequency (in cycles per second) of an electromagnetic wave. The product of these two is then the velocity of light. The cavity was an accurately machined right circular cylinder with optically flat removable ends. In order to reduce losses and to insure a "high-Q" resonance, the cavity surfaces (which were machined from cast iron) were plated with silver.

44, 569 (1950). - Phys. Rev. 78,787 (1950). Handbuch der Physik, Bd. XXXV. 3 1 2 34 E. RICHARD COHEN and JESSE W. M. DuMoND: Fundamental Constants. Sect. 22. whose reciprocal is, in fact, the apparent magnetic moment of the proton, /h', (uncorrected for diamagnetism) expressed in nuclear magnetons, /h" = eh/(4nm p c), where e is expressed in absolute esu. and mp is expressed in grams. If one desires to know the absolute magnetic moment of the proton, /h, a small correction must be made for the fact that the magnetic field intensity at the proton is not exactly the same as the externally measured magnetic field, because of the diamagnetic effect of the proton-containing sample!.

23. The fine structure separation in deuterium. m. by E. S. DAYHOFF, S. TRIEBWASSER, and WILLIS E. LAMB, jr. at Columbia University 2. , with his co-workers 3-6. Parts I and II of this series must be consulted 3,4 for a basic description of the apparatus. It was through this series of researches that the existence of the "LAMB-RETHERFORD shift", the energy difference between the 2 251 and 2 2P J states, was established and accurately measured. From the point of view of fundamental physics, the importance of the LAMB-RETHERFORD shift greatly overshadows the precision measurements of the fine structure separation in deuterium.

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