| Electric Field Gradient |
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| CATEGORIES ABOUT ELECTRIC FIELD GRADIENT | |
| electrostatics | |
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the Electrical Potential V: : It is an important structural property of a Crystalline Solid , where it is defined at the location of a Nucleus . The EFG is non-zero only if the charges surrounding the nucleus violate Cubic Symmetry and therefore generate an inhomogeneous Electric Field at the position of the nucleus. The individual components Vij form a symmetrical and Traceless Tensor . The principal tensor components are usually denoted Vzz, Vyy and Vxx in order of decreasing Modulus . Given the tensor's traceless character, : holds, which allows for a description of the EFG using only two parameters, Vzz and the ''asymmetry'' η : Any Quadrupolar Moment of the nucleus interacts with the inhomogeneous field surrounding it, thus the electric field gradient can be measured using several Spectroscopic methods, such as Nuclear Magnetic Resonance ( NMR ), Nuclear Quadrupole Resonance ( NQR ), Moessbauer or Perturbed Angular Correlation (PAC), provided the nucleus in question has a Quadrupolar Moment . |
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