Quantum coherent effects in multi-Zeeman-sublevel atomic systems

This paper reports the experimental results on electromagnetically induced absorption (EIA) spectra observed in the system which does not satisfy completely the conditions given by Lezama et al 1999 Phys. Rev. A 59 4732. EIA signals on the transitions in the Cs D_2 line are able to be observed, where F_\rm g \leftrightarrow F_\rm e=F_\rm g-1 as open systems. Theoretical model of Lezama et al is good for the case F_\rm g \leftrightarrow F_\rm e=F_\rm g+1, considering spontaneous transfer of atomic coherences or populations this model is not able to explain our experimental results obtained in the case F_\rm g \leftrightarrow F_\rm e=F_\rm g-1. This paper offers a theoretical model which is able to well explain the case F_\rm g \leftrightarrow F_\rm e=F_\rm g-1. It also uses this theoretical model to explain the split and shift of EIA peaks, which have been obtained in experiments.