| Popis: |
Echo envelope modulation is calculated which includes quadrupole interaction of the nuclear spin. The strength of the quadrupole interaction must be smaller than the electron Zeeman interaction and the interaction between the electron spin and the applied microwave field during the microwave pulses. But the interactions of the nuclear spin (Zeeman, hyperfine, and quadrupole), can all be comparable since the nuclear Hamiltonian is diagonalized exactly and no perturbation theory is used. The calculations show that the effect of the nuclear quadrupole interaction on the modulation is to create more frequency components and phase changes on the observed modulation as long as the electron-nuclear hyperfine interaction is not negligible. |
