• R S Ram

      Articles written in Pramana – Journal of Physics

    • Photoacoustic determination of energy band gap of semiconductors

      R S Ram O M Prakash A N Pandey

      More Details Abstract Fulltext PDF

      Semiconducting materials are employed in the fabrication of a number of semiconductor devices and opto-electronic detectors etc depending on their properties, state of purity and perfection and energy band gap values. In the present study, a latest and novel photoacoustic spectroscopic technique has been employed for the determination of energy band gap of some semiconductors namely CdS, CdSe, CdTe, ZnS, ZnO, Se and Si in the powder form. Values obtained have been compared with those reported by conventional methods.

    • Photoacoustic spectra of some laser dyes

      R S Ram O M Prakash

      More Details Abstract Fulltext PDF

      Photoacoustic spectra of rhodamine 110, rhodamine 6 G, rhodamine B, rhodamine 101 and coumarin 102 laser dyes have been recorded at room temperature of 25°C in the spectral range of 350–750 nm. These samples were taken in powder as well as in solution forms. For this purpose the closed and the open photoacoustic cells have been used. It is hoped the present study would be useful for characterization of these dyes.

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