Certain fast chemical reactions involving both paramagnetic and diamagnetic molecular species are termed "paramagnetic pulse" reactions when each reaction event results in a change in a large hypedine magnetic field acting at one or more of the molecular nuclei. The frequency distribution of the magnetic pulses is directly related to the reaction rate. The hyperfine intensity and frequency distribution of the paramagnetic pulses affects the nuclear magnetic resonance (NMR) line shapes. The Bloch equations are used to establish a quantitative relation between nuclear resonance line shape, nuclear, and electron relaxation times, and the reaction rate. The theory is discussed in terms of the Cu 63 NMR work of McConnell and Weaver on electron exchange between Cu++ and Cu+ ions in hydrochloric acid solutions, and the HI NMR work of Bruce, Norberg, and Weissman on the electron exchange between neutral and positive ion molecules of N,N'-tetramethyI-p-phenylenediamine.
Articles you may be interested inWide frequencies range of spin excitations in a rare-earth Bi-doped iron garnet with a giant Faraday rotation Appl.Optical Faraday rotation of rare-earth (III) borate glasses has been investigated at room temperature. The rotation is described in terms of an effective transition wavelength X, which is an indicator of the spectral region of the 4fn-4Jn-l 5d absorptions mainly responsible for the rotation. An experimental investigation of the magnitude of rotation as a function of rare-earth (III) ion reveals the importance of the transition wavelengths and the electric dipole matrix elements as parameters affecting the rotation. The borate matrix is found to be more effective than many other environments in the realization of higher Verdet constants.
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