Quadrupolar Nucleus Sample Clauses

Quadrupolar Nucleus. ‌ The nuclear quadrupole interaction is an interaction that exists in any nucleus with a nuclear spin quantum number of 1 or greater. The actual nucleus has a spatial distribution rather than a point, and the charge distribution is not always spherically symmetric. Therefore, a nucleus with a nuclear spin quantum number of 1 or more has an asymmetric electric quadrupole moment. The electric quadrupole moment is often represented as two electric dipoles that are offset from each other and point in opposite directions. The unit is the product of electronic charge and area, but it is usually given in units of 10−24 cm2 with electronic charge omitted [9,10]. When a nucleus with a quadrupole moment is placed in an environment with an electric field gradient, the energy changes depending on the orientation of the nucleus, resulting in energy level splitting. The nuclear quadrupole interaction is a part of the electrostatic interaction between the electric field created by the electrons surrounding the nucleus and the nucleus that is not spherically symmetric, which changes depending on the orientation of the nucleus. Consider the case where the electric field gradient due to the positive charge is generated around the nuclear quadrupole moment. As shown in Fig.2.5, when the net positive nuclear charge is oblong, the nucleus is more stable in the direction perpendicular to the external charge. (a) (b)
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