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Recording Magnetic‐Resonance Spectrometer
1.If the energy levels are not linear in H, or if there are initial splittings from Stark effect, residual spin‐orbit coupling, or hyperfine structure, this simple formula is satisfied only if g is allowed to be a function of the frequency at which the resonance is observed. Clearly, such a g has no basic physical significance. This fact has been overlooked in much work in this field because of the inconvenience of taking data at more than one frequency. In some of these cases it may be necessary to use frequencies that lie in specified ranges if the transition between two particular energy levels is to be observed at all, even allowing unlimited values of H.
2.We are indebted to Francis Bitter, of this Laboratory, for suggesting that this design be investigated.
3.Flux density is represented here by B according to the mks system; the units are webers per square Elsewhere in this paper H will be used for flux density, as is conventional in paramagnetic resonance work, but the unit used will be the gauss.
4.M. E. Rose, Phys. Rev. 53, 715 (1938).
5.Quarterly Progress Report, Research Laboratory of Electronics, M.I.T., April 15, 1948, p. 36.
6.To avoid discontinuities from the finite number of wires in the helical potentiometer winding, “electrical band spread” is used for the slower sweeps; resistance boxes are used to provide the coarse field setting, and the ten‐turn helical potentiometer covers a range of 1000 gauss instead of 10 000 gauss.
7.Strandberg, Johnson, and Eshbach, Rev. Sci. Instr. 25, 776 (1954);
7.or M. W. P. Strandberg, Microwave Spectroscopy (Methuen monograph, 1954).
8.H. W. Knoebel and E. L. Hahn, Rev. Sci. Instr. 22, 904 (1951).
9.J. C. Slater, Revs. Modern Phys. 18, 441 (1946).
10.R. V. Pound, Rev. Sci. Instr. 17, 49 (1946).
11.F. P. Zaffarano and W. C. Galloway, Technical Report No. 31, Research Laboratory of Electronics, M.I.T. (1947).
12.H. A. Bethe, Phys. Rev. 66, 163 (1944).
13.M. Tinkham and M. W. P. Strandberg, Proc. Inst. Radio Engrs. 43, 734 (1955).
14.Silver mica condensers should be used in these various RC filters to give the maximum stability. The choice between the TT and Z circuits is largely arbitrary; both give infinite impedance at their critical frequencies. If only one adjustable resistance is allowed, the Z circuit seems somewhat superior; if two adjustments are allowed, the contrary is true.
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