Effects of interference between different-order transition processes
Noriaki Tsukada, Takashi Nakayama, Sumiaki Ibuki, T. Akiba, Kazunaru Tomishima · Physical Review A · 1981
The transition probabilities and the shifts of the crossing and anticrossing points of a two-level system (spin-1/2 atom) under the simultaneous influence of a static magnetic field and three orthogonal oscillating rf fields are calculated by using the resolvent formalism in which the rf fields are quantized. A new interference effect, which can be called "crossing of the third kind" in the rf transition, is predicted, and can be interpreted as the interference between different-order transition processes such as single- and two-photon processes, single- and three-photon processes, and so on. Furthermore, for coexistence of the single- and two-photon processes and of the single- and three-photon processes, we can obtain expressions of the transition probabilities (or effective dipole-coupling coefficients) similar to the results obtained in our previous paper, where the interference between single- and two-photon processes were treated by using the time-dependent Schr\"odinger equation.