ZnSe/ZnMnSe MQW structures are grown by MBE. In situ RHEED control all
ows one to lock the growth cycle on the phase of the RHEED oscillation
s so that lattice plane completion is achieved independent of beam flu
x fluctuations and other irregularities. The band-edge resonant optica
l properties of the structures are dominated by sharp and pronounced e
xcitonic features. The influence of strain and confinement on these ex
citons, their localization and interaction with phonons are discussed.