Lecture 1 - Quadrupole Resonance Applications Principles...

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EE 597E Spring 2007 Lecture 1 Quadrupole Resonance Quadrupole Resonance Applications Principles Continuous-wave methods Pulse methods
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EE 597E Spring 2007 Lecture 1 Quadrupole Interaction Energy Quadrupole Interaction Energy Electrostatic interaction of a nucleus having non-spherical symmetry with a non-uniform field of electrons surrounding it results in preferred orientations of the nucleus The electric quadrupole moment (eQ) characterizes the deviation of nuclear charge density from spherical symmetry The electric field gradient (eq) describes the non- uniformity of the electron cloud surrounding the nucleus
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EE 597E Spring 2007 Lecture 1 Quadrupole Resonance Quadrupole Resonance A nucleus with non-spherical charge density (Q 0) possesses a magnetic moment Application of a rotating magnetic field at a resonant frequency corresponding to the energy difference between any two preferred orientations results in a perturbation of the orientation of the nucleus The resonant frequency is proportional to the quadrupole coupling constant: e 2 Qq
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