Graduate Thesis Or Dissertation
 

Spectral investigation of the molecular vibration region of single crystalline potassium sulfate

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  • A spectral investigation of the molecular vibration region of the potassium sulfate crystal system was undertaken. This study was initiated to establish the feasibility of using this crystal as a host matrix for ammonium sulfate. Since these two systems are isomorphic and have unit cells of nearly equal volume the ammonium ion can be studied in a surrounding similar to that of the ammonium sulfate crystal with a variable degree of inter-ion coupling by doping the potassium sulfate crystal with different amounts of ammonium sulfate. The potassium sulfate vibration region was characterized, by infrared transmission and reflection measurements plus laser Raman scattering. A technique incorporating a reflection goniometer was used to identify the habit of laboratory grown potassium sulfate crystals and to guide the preparation of faces perpendicular to each of the three principle axis. Spectra invoking polarized radiation were subsequently obtained from these faces and band assignments made on the basis of a correlation diagram. Preliminary transmission investigations of ammonium doped potassium sulfate gave excellent results establishing the feasibility of this approach.
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