Abstract
We study the spontaneous emission properties of two distinct quasi-continua sets of levels of atomic and molecular systems so close in energy that they behave in some respect as a continuum, yet preserving some aspects of the discrete level structure, depending on the timescales of interest. The first quasi-continuum considered consists of N degenerate excited levels that decay to a single ground level, while the second consists of a pair of energy separated quasi-continua of N degenerate excited levels that decay to the same ground level. We find that the first quasi-continuum can trap population in the system and can completely inhibit spontaneous emission, depending on the initial conditions. For the second quasi-continuum, no population trapping is possible but partial inhibition of spontaneous emission via `dark' lines in the spectrum can occur. Our results are compared with those obtained from the V -type system.
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