Abstract
Stimulated emission has been observed at the M line (2.543 eV) in optically excited CdS crystals under an applied uniaxial stress perpendicular to the C axis at 4.2 K. This emission is strongly polarized with an electric vector parallel to the applied stress. The observed polarization characteristics are successfully accounted for by assuming a radiative annihilation of an excitonic molecule, providing an experimental evidence for ascribing this emission to the excitonic molecule in CdS.
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