SEARCH Articles Figures Tables Electric field gradient quadrupole interaction Electric quadrupole hyperfine interaction Electric quadrupole interaction description Electric quadrupole interactions magnetic perturbation Electrical field gradient interaction quadrupole-inner Electrical interactions Interaction Hamiltonian electric quadrupole Magnetic Dipole and Electric Quadrupole Interaction Mossbauer electric quadrupole interaction Mossbauer spectroscopy electric quadrupole interaction Nuclear electric quadrupole interactions Quadrupole interaction Quadrupole interaction interactions The quadrupole interaction and electric field gradients