Read e-book online Atoms I / Atome I PDF

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

ISBN-10: 3642458696

ISBN-13: 9783642458699

ISBN-10: 3642458718

ISBN-13: 9783642458712

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When the magnetic field of the applied radio frequency resonates with the precession frequency of the protons, an exchange of energy occurs and the resulting perturbation of the precessing protons causes them to induce a detectable" signal" either in the applied radio frequency coil itself (thereby changing its apparent impedance) or in a second detecting coil at right angles to the first!. The ratio, Yp, between the proton precession frequency, w p , and the magnetic field intensity, B, is an extremely important constant or conversion factor because the method of proton resonance has proven itself to be by far the most convenient and accurate absolute method of measuring magnetic field intensities when these are in the range above a few hundred gauss.

RICHARD COHEN and JESSE W. M. DuMoND: Fundamental Constants. Sect. 23. in fact three times its root mean square expectation value. It appears from an analysis of variance of 1953 data [8J summarized in Sect. 5) is the one more likely to have a systematic error. At the date of this writing (1955) work has just been published from the Clarendon Laboratory, Oxford, by COLLINGTON, DELLIS, SANDERS, and TURBERFIELD 1 repeating the inverse cyclotron experiment with certain improvements. The results of this work are in much better accord with those of the omegatron experiment.

A study of this effect was made by varying the loading. The diameter of the cylinder could not be measured accurately by direct means, but the ratio of length to diameter could be determined from the ratio of the resonant frequencies for two modes of electrical vibration (the TE012 and TE021 modes). One of these depends primarily on the length of the cylinder, the other depends primarily on the diameter. The ratio of length to diameter was so chosen as to put the frequencies of the two modes only a few megacycles apart out of 3000 megacycles.

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


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