On the possibility of observing a Bose-Einstein condensation of excitons in CdS and CdSe

It is shown that ideally a Bose-Einstein condensation of excitons ought to be observable in CdSe as a narrowing of the fundamental emission line with increasing concentration above a critical concentration, ∼ 1016 cm3, using available pulsed light sources. It is concluded (with less justification) that the effect ought also to be observable in CdS. Deviations from ideality and their expected effects on conditions required for observation of the condensation and on its existence are discussed. © 1963.