Line Profiles in Nuclear Magnetic Resonance Absorption

Citation

Waugh, John Stewart (1953) Line Profiles in Nuclear Magnetic Resonance Absorption. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/MTG1-GV96. https://resolver.caltech.edu/CaltechETD:etd-05122003-145444

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The general theory of line shapes in nuclear magnetic resonance experiments is first outlined in some detail, and results important to the ensuing discussion are derived. A radiofrequency spectrometer has been assembled, and its design, construction, and operation are described. The fine structure problem for collinear systems of three interacting spins is solved by application of perturbation theory. Application is then made to the special case represented by the bifluoride ion. Experimental determinations of the line shapes and mean square line widths are made for the proton and fluorine resonances in potassium bifluoride, and interpreted in terms of the configuration of the ion. The equilibrium position for the proton is found to be within ? 0.05 A.U. of the center of the ion axis. Similar experiments performed on sodium bifluoride are less conclusive, but limits are set on the possible configurations of the [...] ion in this salt. Line width studies have been made on a number of crystalline coordination complexes. It is found that the cobalt (III) hexammine ion possesses freedom of reorientation in the lattice, but that no such freedom exists in other related compounds which were studied. Finally, an attempt to determine the third proton configuration in phosphorous acid is briefly described.

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