Nuclear Quadrupole Resonance (Nqr)
This brief chapter has been included in the anticipation that biological applications of nqr spectroscopy will increase as time passes. As in the other spectroscopic methods based on nuclear properties, nqr is able to probe the electronic environment at a specific type of nucleus (Smith, 1978; Semin et al., 1975; Schultz, 1970). It is a solid-state phenomenon and thus has much in common with the Mössbauer effect, while biological nmr is oriented largely toward the liquid and liquid-crystalline states. To date, most nqr investigations have dealt with fairly simple substances. The method is generally applicable to the study of a variety of elements (Biryukov and Vorokonov, 1972), and in spite of certain limitations, biological applications may be expected to increase. For the present, however, small molecules are more appropriate subjects for nqr.
KeywordsElectric Field Gradient Nuclear Quadrupole Resonance Double Resonance Nitrogen Mustard Asymmetry Factor
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