Atoms I / Atome I by E. Richard Cohen, Jesse W. M. DuMond, H. A. Bethe, E. E.

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

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POUND: Phys. Rev. 73, 679 (1948). Sect. 22. Cyclotron and magnetic resonance frequency of the proton. 33 ratio of the proton, Yp. It is well known that atomic nuclei exhibit the properties of angular momentum (" spin") and magnetic dipole moment, with the magnetic dipole axis along the axis of spin. When a proton is placed in a magnetic field, one may think, to use a classical picture, of a torque exerted on the proton dipoles which tends to align them with the field. In view of their spin, however, they respond to the externally applied torque by precessing around an axis parallel to the external field with a frequency of precession which is proportional to the applied external magnetic field.

Field thus permitting the frequency of the latter to be held rIgorously constant and measured with high accuracy. 2 2S! state. This was before the existence of the natural (LAMB-RETHERFORD) splitting had been established or realized. The magnetic field was also deemed useful to keep charged particles away from the detector. The third and really most important function of the magnetic field, however, turned out to be that of tuning the critical frequencies of the metastable atoms (through ZEEMAN effect) to the applied radiofrequency field, thus permitting the use of a rigorously constant, rather than a variable, applied radiofrequency which, for technical reasons, is preferable in a high precision measurement of this sort.

L. FELT, J. N. HARRIS and J. W. M. DuMOND: Phys. Rev. 92, 1160 (1953). Experiments involving the ratio hie. Sect. 25. 45 always at the center of this array. The method yields the third derivative of a high order polynomial fitted to the points. The method is of course no more precise than the smoothing of the curve is reliable. The assigned uncertainty (indicated by the arrows in Fig. 14 and 15) was therefore based on variations in the location of the point F'" = 0 when the curve was smoothed in different trials and by different people.

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