Determination of Temperature and Partial Pressure by Raman Scattering Inside a CVD Reactor

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Abstract
Current voltage curves have been measured for the reduction of H+, Fe(III), and methylviologen at illuminated p‐type . The mechanisms and kinetic pathways for the reactions have been elucidated using the ring‐disk electrode where the ring electrode measures the fluxes of the Faradaic products from the disk. Faster processes involving surface intermediates have been followed by measuring the transient currents on switching the light on or off and by modulating the light source. The variation of the different Faradaic photocurrents with potential, with irradiance, and with rotation speed are quantitatively explained by a model in which photogenerated electrons diffuse to the surface of the semiconductor and there undergo competitive reactions with H+, Fe(III), or surface states.

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