Nuclear energy coupling constant

There are other important properties tliat can be measured from microwave and radiofrequency spectra of complexes. In particular, tire dipole moments and nuclear quadmpole coupling constants of complexes may contain useful infonnation on tire stmcture or potential energy surface. This is most easily seen in tire case of tire dipole moment. The dipole moment of tire complex is a vector, which may have components along all tire principal inertial axes. 

Fig. 20 Variation of the fraction <5 of an electronic charge transferred from B to XY on formation of B- XY with the ionisation energy 7b of B for the series XY = 02, BrO and IO. See text for the method of determination of Si from observed XY nuclear quadrupole coupling constants. The solid curves are the functions <5 = A exp(- al ) that best fit the points for each series B- XY. Data for B- -B are nearly coincident with those of B- BrO and have been excluded for the sake of clarity...

The investigations continued with ArAuX (X = F, Cl, Br). In all instances, the Ar metal distances are now about halfway between the reference van der Waals, r dw, and covalent, rcov, bond lengths (see Table 1). This is accompanied by dramatic changes in the Au nuclear quadrupole coupling constants and large ab initio dissociation energies. Further evidence for real chemical bonds between Ar and Au comes... 

When a nucleus with a quadrupole moment is situated in an inhomogeneous electric field, there is a quadrupole splitting of nuclear energy states directly proportional to the quantity e Qq, the nuclear quadrupole coupling constant. In an axially symmetric field (t) = 0), the energy arising from the quadrupole moment (eQ) in an electric-field gradient (q) is ... 

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