Resonance condition hyperfine structure

Isotope shift and hyperfine structure studies on short-lived radioactive nuclides depend crucially on the sensitivity and the conditions of on-line production in nuclear reactions. Here, the search for a workable concept of experiments with fast isotope-separated beams was initiated by Otten. It was Kaufman who pointed out that the narrow velocity distribution along these beams corresponds to nearly Doppler-free conditions. The experimental scheme, worked out in early 1975, included cw-laser excitation with high resolution and efficiency of a neutralized fast atomic beam and detection of the resonance fluorescence. A detailed discussion of the basic... 

The ESR g-factor is also known as the Lande 7-factor or spectroscopic splitting factor and depends on the resonance condition for ESR (Eq. 3) and is independent of both applied field and frequency. The 7-factor of a free electron is 2.002322, while the 7-factors of organic free radicals, defect centers, transition metals, etc. depend on their electronic. structure. The 7-factors for free radicals are close to the free electron value but may vary from 0 to 9 for transition metal compounds. The most comprehensive compilations of 7-factors are those published in [75], [76]. The magnetic moments and hence 7-faclors of nuclei in crystalline and molecular environments are anisotropic, that is the 7-factor (and hyperfine interactions) depend on the orientation of the sample. In general, three principal 7-factors are encountered whose orientation dependence is given by ... 

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