Interference effects in quantum transitions

A. A. Panteleev, V. Roerich

We study the effect of quantum interference on the structure and properties of spontaneous and stimulated transitions in a degenerate V-type three-level atom with an arbitrary total momentum of each state. Explicit expressions for the factors in the terms of the relaxation operator and stimulated transition operator with account of quantum interference effects are obtained. It has been demonstrated that the condition for the dipole transition moments to be parallel is insufficient and for conventional atoms the interference cross terms are zeros for both operators. The conditions when quantum interference influences the properties of the relaxation operators have been analysed. For the stimulated transitions this condition is shown to be anisotropy of the photon field interacting with the atoms. This case is minutely studied for the D-line of alkali metals.

A. A. Villaeys, Karl F. Freed

É. K. Sadykov, L. L. Zakirov, Юричук Александр Александрович

In recent years there became actual studies of quantum interference on gamma spectroscopic transitions induced by coherent perturbations.A special attention is paid to gamma transitions in compound systems. In this work it is shown that quantum interference effects (QIE) occur in gamma quantum spontaneous emission spectrum of an electron-nuclear paramagnetic system when electron spin resonance is induced. Occurrence of QIE is connected to preparation of the quantum system initial state. The role of electron relaxation is defined: increase of relaxation rate leads to extinguishing of QIE. The cases of stationary excitation of Mossbauer levels by wide and narrow spectra are considered.

M.I. Podgoretskii, Олег Антонинович Хрусталев

Introduction 682 1. Interference transitions between states of nonradiating systems 682 2. Effect of radiation on interference transitions 684 3. Beats 687 4. Experimental applications of beats 689 5. Interference effects in level crossing 693 6. Modulation 696 References 698

D. I. Blokhint︠s︡ev