Abstract
Brillouin scattering of light by sound waves in photoconducting CdS under current saturation conditions gives a fair explanation for the multisaturations of the I–V characteristic. The acoustic flux is spread in the symmetry plane ⊥ to the C axis and is made up of on-axis and of-axis shear phonons respectively responsible for the first and second saturation. Off-axis modes are located in privileged directions which depend on the crystal size and surface treatment. D. L. White's theory explains the whole experimental observation and foresees the occurrence of more than two knees in the I–V characteristic.
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