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Photoacoustic Spectroscopy (PAS) has been set up at Physics Department, KMITL, in order to characterize some interesting materials. The system consists of high intensity broad spectrum light source (Xenon lamp 450 W), PA cell from MTEC model 300, UV-VIS monochromator and lock-in amplifier with chopper. The wavelength selection is usually controlled by HJY Spectrometer Control Program. Cadmium Sulfide (CdS) powder was used as the sample to determine its energy gap. The energy gap of CdS from our experiment is 2.43 eV with respect to 2.42 eV from the accepted value.
Keywords: photoacoustic spectroscopy (PAS), Eg of CdS
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